I have never been married and for many years I didn't date at all, and I know some of my family thought I was gay, by some of the comments they made. It used to bother me but I don't care anymore. Most of them don't know about Steve either (I keep my personal life to myself even with my family). I have been approached by gay women before and I just tell them they are not my type and that I prefer more chest hair.
If I think someone might think I am gay (because I have never been married) I just mention something about not finding the right guy yet (is there such a thing?) or being on on-line dating sites (been there, done that, doesn't work...).
One thing you could say is that you rent out a room in your house to help with expenses. I sometimes wonder about two people together of the same sex but would never ask or say anything on that order. None of my business anyways, and I am just curious and don't have a problem either way.
Barbie