One afternoon I invited an older guy (39) over to my house, as my Mom was going out for the evening and night with her friends from work. And also met up with other guys, usually a lot older than me. For years I played with a good friend of mine from school (posted a story about him, as he was my first).
However, on the side I have always fooled about with guys. So I was 21 at the time, had a number of girlfriends in the past who my Mother had met, and did all the usual relationship things.
Mainly after being caught by my Mother who had no idea up until one faithful evening. As my username suggests, I am actually bi and have been open about this for a number of years.