I disagree completely. If a cis woman was intersex by nature and had a penis or a cis woman wore a strap on. It makes no difference. It's still straight sex. I'd say the line crosses when men don't care about their partners gender and care more about femininity. As a trans person myself I've met different types of men into trans women. Some like trans women who are fully transitioned or have just not had bottom surgery. They think of trans cocks as large clits. And there are other men who fall in between the sexual spectrum. They don't care about what gender their partner is but care more about how they present themselves. These men are finsexual. They are exclusively attracted to femininity. They like smooth bodies, long hair, petite frames, high voices, fem clothing. So their desired person could be women to very fem twinks and femboys.