Pluto on the ascendant increases sex appeal. I have seen that many times. Pluto in aspect with mars produces a dark sexual magnetism. Neptune especially in hard aspects gives a charismatic personality and increases the sexual aura. Uranus produces an unusual attraction combined with nervousness and excitement. Anything that touch Venus will produce further attraction. Pluto for example gives a mystery type which attracts people who loves such types. Uranus-Venus gives a more fascinating personality. Jupiter-Venus makes people more warmth but not necessary more sexually attracted.
What about Pluto tightly opposing the ascendant / conjunct descendant?