The alien trafficking thing must be what it is. The giant does have giant balls and does refer to bodily functions, but I wouldn't call it rapey.Maybe...I asked the guys at the comic book shop I go to about my 10 year old reading it, & they told me about the the giant balls. My next question was if it was rapey at all & they were like, "Kind of'.
Having said that, there are some very graphic depictions of violence and somewhat graphic scene of sex in the storyline. I'm not sure it would be suitable for a 10yr old. Read it and decide, I guess?
All of the stuff I listed is geared towards adults. No punches are pulled.
Hellboy and B.P.R.D. would be just fine for a 10yr old, though.
Another one that is great is the all-time classic: Sandman!