Generally guys are full of bull shite , we have found guys are really gay ( all about the male half ) or straight to trying to get a leg over wife , I generally talk with them and just state the obvious like would love to blow your cock or send him a dick pick and wait for response .
Then again we have been with straight couples and he gave me a bj ( so confusing sometimes ) he just said always wanted to try and loved it !
I guess it's relax and go with the flow , if it feels right go go go for it , if not stop 🛑
