I'll just say I'm straight (I do find women attractive, but not as often as men, and I am in a straight relationship). I'm not a huge romance reader in general, but I do read and write more occasional malexmale stuff (for my own (unpublished) writing it's about 50/50 split between straight or gay(both malexmale and femxfem), but for reading it's almost exclusively gay). There's a couple reasons for it.
The obvious one that other people have mentioned is that reading content that primarily engages with male characters means you have a soft guarantee to avoid misogynistic tropes and societal expectations placed on women. Some BL still makes sure to take a huge dump on women, but a lot of it actually doesn't (and sometimes the supporting female characters are actually interesting and fun in their own right, and they can just BE themselves since they're not in the story to make themselves attractive to these dudes).
The other reason is I just don't find the standard trappings of het romance attractive. I don't like aggressive men. I don't like men with handsome shovel jaws and 12-pack abs and a 10-year age difference and cooing offers to spoil his baby with his millionaire money and whatever other boring or borderline misogynistic/infantilizing things pass for marketable to straight women. Malexmale stuff tends to have a wider variety of male leads who have a broader emotional/character spectrum so while not all of it appeals to me, I know that there is stuff that does. Therefore, even though I know there is a sliver of het romance that would appeal to me (and I've seen and read it!), I usually just go for the malexmale stuff because it's a better guarantee of not wasting my time.
But, like... I don't read any of the BL stuff that's on tapas, for example. I think I'm subscribed to a couple sci-fi ones that have a gay undertone but they're not marketed as BL. Normally the BL label makes me skip over it immediately because I imagine the typical UWU GAY BOIS~ schlock. But if it's not BL and in the description I can see that it's leaning towards a romance, I'm much more likely to give something a try if the romance looks to be between two men (or two women, but that's more rare, and I will only read it if it's written by a woman).