Factually speaking yes but practically speaking gay/straight people tend to be doubly touchy about their partner "playing for the other team" so to speak. Which... I mean, cheating is cheating is cheating lol
A wife might be accepting of a husbands bisexual adventures and not consider it cheating. What about her parents, his parents, children, family, coworkers, congregation, community, etc.
I wasn't speaking directly to that, moreso that secrets have value. Some people would reveal their secrets rather than be controlled with them, others will define the value of their secrets by what they're willing to do maintain them.
It's easier for a straight person to pass off a straight dating/hookup site vs. a "straight" married person on a gay/bi site. The straight person can just say they used the site before they were married, etc. whereas there's no such excuse for the gay site.