Wants some kinky stuff

I met a man on line dating app (65) and I’m (66 F) about 2 months ago and have texting back and forth we have had some great conversations about life and how we got to the point where we are now. We seemed to be on the same page. Until a few days ago he started up conversation about sex. And how he has fantasies about being with a Femdom, I didn’t know what this even was until he told me to Google it, so I did out of curiosity mostly. And this is way out of the box for me. My question is should I see this as a warning sign that I might be in over my head? He has told me some very personal things about what he likes to do like wearing female lingerie. Even went as far to ask me what I thought of bisexual men but only in a while he would like to experience what it’s like. The more he opens up the more uncomfortable it becomes. But he always says that these are his fantasies. And has never acted on them because he has not found a partner that is willing to try it with? Again am I walking into dangerous situations I might not be okay with? Someone please explain this to me. At my age I had never heard of such a thing.