I know the Saturn archetype is as you say, but I can confirm that it just means that sex life could be delayed. As others said, it could be fear of intimacy that subconsciously inhibits you, or it may be that it'll come later in life.
Mind you that I've always been insecure about my body image and I've found myself very insecure when flirting, and the results were imaginable. I've had a 3 years streak of celibacy from 2010 till 2013.
Then I've been in a 2 and a half years relationship that didn't end well and since then I've only had sporadic, occasional sex.
That was until in 2016, transiting Pluto in the 7th trined my Venus in the 4th. I acquired self-confidence and that was my turning point. I began having sex with women older than me (one was 10 years older), since I've always been attracted to older women. I suppose that's another manifestation of Saturn in the 8th and Capricorn DSC.
Now I'm in a happy, open relationship with a strongly Uranian person (I have Uranus conj. DSC), and I realized I can only be in open relationships for the time being.
Don't worry, it will happen. Maybe during your Saturn return. And sex is overrated anyway IMO.
Well, I've seen that Mars and Jupiter in either 5th or 8th house quite makes a difference. An astrologer named Wayman said that Venus in the 10th house means that one cannot find love until they have some success in career. I'm still unemployed. Also, my first book wasn't that successful since nonpolitical books don't usually have success here. When it comes to romance, I really don't like how men treat women in my country.(All those but touching and pretending to want to ran over me with their car when I go out.) Frankly, they make me feel threatened. An astrologer astrolada said that Cancer Ascendant don't find love after 35, taking as an example that princess(duchess?) that got married with Prince Harry.
It's interesting that I have Capricorn Descendant and Saturn in the 8th house, but I never liked much older guys. Every astrologers says that. I also have Venus in the 10th house sextile Saturn.