A book that I got as part of a birthday present when I was in middle school had a passage where a man's long-lost sister (who was part monster, but was painstakingly described as very attractive) told him that either he had to impregnate her the old-fashioned way, or she would simply get a syringe, extract sperm from his testicles, and impregnate herself that way to create, if I remember correctly, a monster that would end the world or something. It was labeled as "Young Adult" level.

So, like, probably something like that.