Mother accused of 'gifting' teen daughter testifies about jealousy as A year- old girl testified Thursday that she first began having sex The child said Kaplan began having anal sex with her when she was 7 years old. I was just told that the man I'm interested in likes anal sex. Is this common behavior for heterosexual males? I can't seem to find any information. In a group discussion as part of the study, young men said anal sex was Only one young woman in the study stated slightly positive feelings.