Do you think my friend was biual?

To tell you the truth I dont belive he is bi, I think he might be gay. A lot of gay men and s try to hide their true feelings by being with the opposite , so people wont find out. however sometimes it can slip , Like the feeling of joy he had from another male caressing his leg. Also, if his mannerism are kind of girly and his voice sounds feminine then that is also a sign that he may be gay.