I get what you're saying, and sometimes (Remmick's head) Star Trek goes too far. However, if the show is going to have heterosexuals in romantic, relationship, family, sexual situations, then it can and should have gays in similar situations.As long as it's a show for the family
The show has shown hetero situations (not only sexual) right from the start, pilot one. However the show can be subtle, Riker was a ladies man largely through inference, and not owing to us seeing him hopping from bed to bed.
The show can make clear that a character is gay without having to repeatedly show them in a gay sex scene.
Through the years here on the BBS, many have advocated the gay character being in a steady relationship with a same-sex partner who is depicted by a reoccurring character. The way Barkley, Ogawa or Guinan weren't in every episode, but you knew who they were when they made a appearance.
The partner would share quarters with the gay character, discussing the episode events over lunch, be seen in the background of a "ten forward" scenes talking while principal dialog is going on the the foreground.