3 hours of actual intercourse is a little too much. But 3 hours of romancing each other, giving oral and manual stimulation, massages, kissing, all that good stuff... Some people consider that "sex". 3 hours of that isn't unreasonable for a couple that has the time and desire for it. Especially a new couple just discovering each other's bodies.
yeah, if u have pubic hair around there, most prob cause is that its ripping ya pubic hair.
but u should go get checked out.