This is a subject that has interested me for quite some time.
My observations have led to me the conclusion that Venus adds grace, form and symmetry, along with innocent charm, and that Pluto gives sexual charisma, magnetism and a powerful presence. Venus and/or Pluto must be aspecting either the Sun or the Ascendant in order for a native to be considered a sex symbol. One can be attractive to the opposite sex without these aspects, but nearly all sex symbols (people who have been World famous for their physical Beauty and sexual charisma), and I have looked at hundreds of charts, have either the Pluto or Venus or both, in aspect to either the Sun or the Ascendant. Angelina Jolie has Venus conjunct Ascendant, and Sun is trine Pluto. Brad Pitt has Pluto Square Ascendant, and Venus is trine Midheaven too. He was literally made famous only because of his appearance. Venus Trine Midheaven = Charm your way to success.
Leonardo Dicaprio has Pluto conjunct his Ascendant, and Sun is conjunct Venus.
Ingrid Bergman, famous Swedish actress and Beauty Icon has Venus conjunct Ascendant, and Sun in sextile to Pluto. Her charms and radiant sex appeal is made stronger by a Venus-sextile aspect. Venus-Pluto aspects gives strong sexual charisma as well.
Grace Kelly has Venus conjunct Ascendant, and Sun trine Pluto.
Errol Flynn, the Brad Pitt of the 1930's, had Sun conjunct Pluto, and Pluto sextile to Ascendant. He is widely regarded as one of Hollywood's sexiest men of all time.
Pluto's sexual magnetism is much stronger than Venus. Venus gives general Beauty and symmetry but Pluto is capable of casting love spells on others. They usually influence others in a very powerful way, and when an attractive person receives an aspect from Pluto, that person is certain to have people obsessed with him/her.
Beyonce is Another; Venus and Pluto conjunct the ascendant. And that woman got a great deal of sex appeal for sure.
Claudia Cardinale; Sun Square Pluto, Venus conjunct Ascendant. Famous Beauty Icon.
Ava Gardner; Venus trine ascendant and Sun opposition Pluto. In her prime, regarded as one of the most Beautiful women in the World.
Kate moss; Pluto sextile ascendant, trine venus with venus opposing her ascendant. (All venus aspects to ascendant gives grace, symmetry and Beauty/charm)
Sylvana Mangano; Pluto trine ascendant, Venus sextile Pluto and Venus opposing ascendant. Regarded for her Beauty and charisma.
There are thousands of examples. The biggest beauty Icons in history, both men and women, who are regarded by the majority of people as extraordinary handsome, attractive, magnetic and Beautiful, ALL have these aspects. I haven't come across a single exception to be honest, and the handful I found who are regarded as Beauty Icons, and yet lack an aspect of Pluto and Venus to Sun/ascendant, are still nowhere near as Beautiful and magnetic as the ones who got them. Beauty is not objective, and Astrology has clearly shown that. It is pretty safe to say that in order to be a sex symbol like Angelina Jolie, Grace Kelly, Brad Pitt, Errol Flynn etc. you got to have either Pluto or Venus (or both) aspecting Sun and Ascendant. It must remembered that a lack of these aspects do not in any way suggests ugliness. There are thousands of people who are magnetic, even regarded as Beautiful, but they lack that magic touch that separates ordinary, handsome people from those magnetic superstars who a couple of times every Century show up.
It is true that some actors (Johnny Depp, Jennifer Aniston) lack any aspect between Venus/Pluto to Sun/ascendant, but let's face it, although they are attractive, they are nowhear near, say for example, Brad Pitt or Angelina Jolie. Angelina Jolie is such a typical example of plutonic charm, so is Brad Pitt, with these piercing Eyes that radiates sexuality even when he is not trying to look good. And that is what is so fascinating with Pluto. Venus is charming because Venus tries to be charming; it is a conscious process on the part of Venus. Pluto is magnetic and "sexy" without trying, it is just natural. The plutonic charm is so unmistakable that when I see it I know immediately it is Pluto; the smooth, intense natural charisma that penetrates nearly everyone escapes no one. Pluto represents Power, and it is not Always the Power of Pluto is manifested as sexual energy; sometimes it is simply so that the person looks very intimidating, but when it DOES manifest as sexual energy, and these Movie stars are the finest examples of this, there is nothing that can beat it. No other planet will give such a big dose of sex appeal such as Pluto. Perhaps it is because that we associate sex with something "forbidden". Like too much innocence is not commonly regarded as "sexiness" and the Pluto gives a mischievous flair to the person, yet without being creepy or unattractive. When you see someone who looks mischievous in a very subtle, sexual manner without trying, that person got Pluto in aspect to Sun and Ascendant for sure.
I grew up in a Place where almost everyone looked good. I seriously didn't have a single unattractive girl in my class. I have studied the horoscopes of my peers, my friends and I have found a great majority of them to have Venus in aspect to Ascendant.
The most attractive person I have ever seen in my entire Life, and I was not the only one who was totally enthralled with the person, had Pluto aspecting ALL planets, including the Ascendant. The person was so magnetic, so extremely Beautiful that people became obsessed. That person would have been a World famous Beauty Icon if famous, I swear. Unfortunately the person got into drugs and drinking and was destroyed - a tragedy.
I have noticed somethings about planets and their influence on appearance. To put it shortly:
Sun: When in Connection to the Ascendant, and favourably placed; it gives glory, honor, authority and a sunny disposition to the appearance.
Moon: Makes the person look warm and caring, a Little sensitive, nurturing etc.
Mercury: Tend to look scientific, Cold, sometimes dishonest, intelligent, curious.
Venus: Gives charm, grace, symmetry, Beauty, a pleasing appearance.
Mars: Gives an athletic, rough, raw, passionate appearance, radiating energy and will.
Jupiter: The cheerful one. Marks the face with joy and optimism, people want to hug this person and hear stories told by him/her. The person looks as if she/he is full of faith and security. Gives joval Eyes and often quite a big mouth.
Saturn: Makes the person either look Cold and stern, or troubled and defensive. Gives either extremely good bone structure, or flabby features, depending on aspect.
Uranus: Gives eccentricity to the appearance, impossible to tell how this may manifest.
Neptune: Gives a dreamy, sensitive, youthful appearance with soft features, sometimes they look slightly "fishy" - not ugly, but with flattened noses, soft ears and soft skin. Rarely look rough.
Pluto: Looks intimidating, powerful, intense, often with small piercing Eyes radiating energy and drive, as well as sexuality and a slightly "mischievous" quality. Can sometimes look dark and slightly geeky (interested in the occult).
. I just went to a religious center and I came back home with lovers lol (not trying to brag). I also have Venus 1st and conjunct AS at Aquarius. Aphrodite (Virgo) trine AS, and I guess because Aphrodite in Virgo is a few degrees away from reaching Aphrodite in Libra it trines with AS in Aquarius. 
I've always been curious about Aphrodite's role in astrology. Not even sure where mine is.
