For me it’s foot fetish stuff. Every damned thing else is on the table but before I could make the lethal mistake of talking about it, she expressed her giga-ick about the issue. To this day I thank God I saw the metaphorical fly hit that electric fence before I walked into it.
As a bi dude, I feel you. Except with me it doesn’t lead to fetishization. It leads to a loss of respect, cheating, and destruction of the relationship.