I've known I'm bi since I was about 14 or 15. I had my first sex date with a guy when I was 20 or 21. Although I love fucking women, with men I only want to bottom. The feeling of being used and filled is a huge turn on both psysically and psychologically for me.
I've been married to my wife for 8 years now, been together 11. It took a while before she was open to fucking me with a strap-on. It was hard for her to understand because when we have sex, I'm usually dominant and she loves being submissive. She doesn't fuck me everytime we have sex of course, but when she does it's a complete role reversal and she loves it.