...only under the push over the last 15 years or so to treat sex as wholly irrelevant, ot the point I was accused of transphobia for describing the TERF viewpoint as being about sex, not gender - essentially TERFs aren't concerned with whether you identify as a man or woman gender-wise but whether your sex is female (and thus you are good and safe) or male (and thus you are an evil, dangerous monster who preys on females, regardless of your gender identity).
Once upon a time (hitting a tipping point around 2010 or so), whether it was hetero- or homo- sex was definitely seen as being about the sex organs of the people involved and not how they identified.
Not really. In queer spaces it was always mixed depending on the time place and situation, with a general default to “if there’s a reason for it to be considered homosexual the law will probably say it is so we will too.” But also you have folks like Christine Jorgensen who was hailed as cured from homosexuality by transitioning. With trans people you generally had the idea that your sexuality was the orientation of the group you ran with, so stealth straight trans people were seen as straight by those who dealt with them, but the straight trans people in drag scenes were generally seen as gay. You even wind up with weird shit like how for a time in the 80s and 90s in lesbian discourse trans lesbian meant ftm but transsexual lesbian meant mtf. Also homosexuality and heterosexuality as a concept didn’t enter our culture until the Victorian era before which at various times places and people it was was seen as anything from inherently an intersex condition to a sin made of free will
They're obsessed with sex, but imaginary sky daddy said it's bad, so they resist it as best they can while lashing out at anybody who visibly enjoys it as proof that they themselves are superior for resisting, and not the festering pile of shit that their own subconscious mind accuses them of being.
(Why else does every vocally anti-gay conservative man get caught with rentboys?)