Invasion of Alien Bikini

Young-gun appears to be a timid boy, but it's actually just a mask to hide his nighttime adventures as an urban avenger. One evening he rescues a girl from a bunch of thugs. The young woman wants to reward Young-gun for his heroic deed, but all her gifts of seduction will be useless in view of his vow of chastity. This would sound like the plot of some typical, racy comedy if it weren't for a small detail: the lady in question is actually an alien who needs Young-gun's seed for her race to procreate on our planet. (Sitges Film Festival)