You're not alone, OP. Apparently fandom seems to assume bisexuality as the norm, and gets all weirded out by straight women who just don't want women in their porn. I don't ~hate~ women. I like female characters, lots of them. But I don't find women sexually attractive. I don't want breasts and vaginas in my porn, it turns me off. I want to read porn about men because I find MEN hot, not women. It's that simple. So unless you think all heterosexual women are just unsuspecting victims of internalised misogyny who would actually be bisexual if they didn't hate women so much (which is dumb), judging people for only shipping m/m is just ridiculous.