One of my russian friends who acts quite macho flirts with gay men (i saw this on 2 occasions). The gay men were quite gay (no benefit of doubt!). He also felt the abs of a gay guy at a party recently. My friend also caught me buying large sized condoms on amazon but he didn't show any interest. We go to the sauna (male/female mixed sauna) together often and he likes it a lot, and claims that he likes it since he is russian. I am curious if my friend is bi since me and my gf are planning on a 3some. I have some bi-ness in me but gf doesnt know that and i'd like to keep it that way. Any thoughts? or how do I check for sure if he is bi (without asking him!).