Sometimes it can also boil down to this:

Are you willing to reverse roles?
Are you willing to reverse roles in the bedroom?
Are you willing to.....do things that go against YOUR nature?

I found out much much much later in the relationship, he was pretending to be a woman when we made love.
That broke my heart. I felt like nothing then.
I always felt there was something wrong with me......and he let me believe that.