No, sorry, i'm disagreeing.
I had ideas of an X-com game myself, even a serious of short stories. X-rated.
No sexual tension?
Main screen turn on! List:
1)Aliens kidnap living beings for experiments. While cattle might be turned to battle-hulks,
humans might be getting some more interesting treatment.
2)Amongst alien artifacts there is virtual reality, which X-com sciencests explore.
Cadets get to play it and train in it in free time and UFO's can use it on captured humans.
3)With some imagination, the alien races could be made more sexy.
Apocalypse had human-sectoid hybrids who were basically thin human with big black eyes
and good psionic abilites.
Snakemen V2 could be snakewomen or snake-handsome men.
Mutons have their 'nads removed, but their sexual drive could be left, imagine what
they do to ones the capture...
4)Tentacle creatures. X-com 2 terror from the deep had them, why can't they appear on land?
5)Who knows if sexual stimulation does not help humans awaken their psionic abilities?
6)Some say that alien craft engines have a particulary arousing effect on humans.
Flying suits built with them are said to be a truly far out experience.
7)Guys and gals in tight uniforms, running around with guns, stun-rods, maybe they are
issued hand-cuffs too? Comraderie, you say?
8)When aliens mind-control someone, he needs to be stunned/restrained for his own good.
What's a good method of bringing him to his senses?