Is wearing a Speedo gay?
Is wearing tight Levi’s 501s gay?
Is showing a VPL gay?
Is looking at a men’s fitness magazine gay?
Is looking at a soft-core gay porn magazine gay?
Is former Senator Larry Craig who tapped his foot in an airport men’s room but otherwise led a straight life, gay?
What about the gay symbolism in football?
The tight uniforms with the shoulder pads exaggerating the male form
Slapping each other on the butt
Tight ends
Penetrating the end zone
Jockstraps visible through the uniforms
Posters on LPSG can select the proportion of gayness in their orientation, and most are not completely straight. Perhaps that small amount of gayness in most straight men recognizes and is stimulated by male genitals and the male form. Perhaps some of them are troubled by that stimulation, maybe more now than in the past. Of course, women can see this male display too, and may react negatively also.
The sexual suggestiveness of clothing is not either yes or no, but instead is a shade of gray. Baggy clothing has little and jockstraps have a lot. Gay men looking to attract other gay men want to display their sexual attractiveness more openly than straight men looking to attract women.
Jockstraps have erotic appeal to gay men: the genitals are emphasized and the butt is uncovered and available for penetration. If Straight men don’t deny and reject male erotic stimulation, their complete straightness is questioned.
So yes, wearing a jockstrap is gay, but it didn’t used to be so much in the past. You were required to wear one in gym class. Now you wear one in gym class if you are gay.
Here is a link on football:
Behavior: Football as Erotic Ritual - TIME
And here is one on men’s clothing:
BAGGY Pants