Is it normal to wonder what its like to give oral sex on a penis?

I do not have a wife who swallows my sperm. It is often a fantasy of mine to have her do so, she also doesn't give me oral sex a lot of the time. But lately I got a really bad thought or type of thinking, does this mean I fantasize about sucking dick or about having cum in my mouth? I am NOT attracted to males nor would I ever have intercourse with them. I am just curious what it is like for a women to be doing that to a man and what it feels,tastes, looks like. Why is it fun, disgusting, good etc. Anyone wanna weigh in for me please? Thank you.