A little boy walks into his parents' room to see his mom on top of his dad bouncing up and down. The mom sees her son and quickly dismounts, worried about what her son has seen.
A girl asks her boyfriend to come over Friday night and have dinner with her parents. Since this is such a big event, the girl tells him that after dinner, she would like to have sex with him for the first time.
A guy went to a psychiatrist because he was having severe problems with his sex life. The psychiatrist asked him a lot of questions, but didn't seem to be getting a clear picture of the problems.