I have to admit I was quite taken aback last night when I read this thread, but wonders never cease when someone is in crisis. So, today, I met up w/a really good male friend who knows all about what's happening in the strange world of life and I posed your situation to him.
He told me that this is a new fad w/the younger generation. However, it is also very popular w/people who are heavy into the porn scene. My question to you is this, have you found any porn sites on your computer? Books lying around, him wanting to try something new and kinky?
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.