They aren’t. Repeated studies done over many years have shown that gay men have much higher rates of depression than straight men. And anxiety for that matter. It’s not even debatable. Now why this is, is not known.
Repressed? Well gay male culture is pretty wild, and sex is a lot easier to come by. Gay men have told me that getting sex in gay culture is as easy as filling up your gas tank.
Straight men have to deal with the inhibitions of women, so that may well make us more inhibited. It’s just not so easy to get sex from women if you are a straight man. It’s much easier to obtain sex of you are a gay man, which is why gay men statistically have far more partners than straight men.
Straight men have to be careful about everything we say and do. Talk to the wrong woman? Whoops, you’re a creep. Looking at that woman over there? Call the cops, that’s creepy! And that’s not to mention anything remotely resembling a come-on, where people’s reaction often seems like you set off a grenade in the room. And on and on forever and ever.
Straight society is full of cockblocking idiots of both sexes. Married men are some of the worst cockblockers of all. A lot of young married men seem to have no other goal in life but to cockblock all the single men in sight. Modern feminism is extremely puritanical, and the idiotic specter of “sexual harassment” looms over much if not all straight interaction in public and even in private. When I go out in public, it often seems like the whole world is deliberately cockblocking me. White people are by far the worst cockblockers of them all, vastly worse than Blacks or Hispanics.
Gay culture is much more Wild West when it comes to sex, and they do not have to deal with a lot of the anti-sexual nonsense that women put out as the gatekeepers of sex.
Still, a lot of straight people are really opening up about sex and having lots of sex nowadays, so we are less repressed that we used to be. But most straight men would probably be uncomfortable in orgies and maybe even threeways. On the other hand, the number of gay men who have gone to such things as orgies or have threeways is extremely high. Group sex is definitely a common aspect of modern gay life.
What with the orgies, threeways, very high partner counts and general anti-Puritanical atmosphere of gay culture, it should be no surprise that gay men are more loosened up about sex than we are.