see conversation forum #258185
This tag is for a situation where a character of ambiguous gender is using part of itself or an object to stimulate part of someone else.
It is fingering a vagina, fucking a cloaca, or shoving a dildo down someone's throat.
'Using' does not necessarily assume consent or dominance, so this tag is still appropriate for a dominant ambiguously-gendered character having vaginal or anal sex with a male because it is still receiving his penis, even if it is using force.
To determine who is the giver and who is the receiver try to think who has the 'passive' part and who has the 'active' part.
An odd exception to this is penetrable_sex_toy, as a person can put this in their hand and 'use' it on someone else with much more control than the person it is being used on. What if we know it's a ambiguous character who has been turned into another gender OR whose gender has been revealed?
Tag what you see.