I mean, I had what you could call an open relationship with a straight friend in school for two years. We fucked and did pretty much everything except for him bottoming, we saw each other every day, slept together, met out families, blah blah the whole romantic deal. While we had sex with other guys (in my case) or girls (in his), we only cared for each other. It was real, and while we may discuss what was straight about him, he never called himself anything else nor did he show interest for any other guy other than me. Labels are overrated, haters gonna hate, carpe diem and all that shit