I think it depends on the type of genital piercig you get. My ex boyfriend had a frenum (runs longways on the bottom right behind the head). He had sex the very next day. Just had to be careful and use a condom to avoid getting any contaminants in the holes.
I have only 6 piercings now. I've had up to 18 at one time. Now I only have earlobes, nipples, and tongue.
two tongue rings, the little nubs on the front of the ears (don't know what they are called), had my eye brow pierced several times, and the side of my lip. Thought about piercing my schlong but the no sex for 6 months thing always scared me.