Infection jokes

So I was eating this girl out the other day, and I GOT AIDS. How does a 9-year-old give me AIDS? I guess my sister was hanging around the wrong crowd.

What is a lot?

Syphilis.

Little Johnny went to the doctor to get an infection checked on his penis. As the doctor examined it, he asked, "Lil Johnny how did you get an infection on your penis?" Johnny replied, "Well, the damn neighbor Sally's braces are too sharp."