Being gay is becoming more and more accepted , bodybuilding attracts gay men ... why would he marry a woman if he was gay ?
It's not like his career would suffer if people knew... actually more like the opposite , he would get even more g4p offers , maybe some judges would be interested in him etc. etc...
By the way there are a lot of people on here that are waaaaay to concerned about other people's sexual preferences that's for sure.