All varieties of sex between consenting adults are equally legitimate, and they should not be sanitized or euphemized solely on grounds of perceived mores or tastes, if the creators of the product in question do not feel thus inclined. By sidestepping gay male sex, we reinforce the notion that sex between men is less than normal, less than salubrious to the mind.
But in most cases the audience does matter, particularly for films that are produced for distribution, and sometimes it is especially difficult to push the envelop when the public have trouble catching on. Can anyone advocate for more equitable portrayals of sexual intimacy between male characters (who may or may not identify as "gay" in their fictional universe), relative to its heterosexual/lesbian counterpart, without being attacked as salacious brain-washers, or without risking dovetailing with the narrative of LGBT advocates being self-serving agenda-pushers?
Maybe a good starting-point would be to recognize the various shapes and sizes of gay people, to see gay people as real humans rather than caricatures prancing around with pink boas. That said, I am more sanguine about the cinematic prospects of "man-on-man action," since I know there is a growing community of straight women who get a kick out of watching it.