I bought a slot for an M/F explicit piece, and I bought the female slot. The pose leaves ambiguous penetration, so the bottom slot could very easily be make if a dick is drawn on the character. I buy the slot, the artist (ponsex) messages me, and I send them the ref of the character. I send them the nsfw reference, which shows clearly visible female bits, and as all my other YCH experiences have gone, I expect to be asked if they have any questions about things like outfits, color, edits like cum, internal shot, etc, but for the most part its straightforward.
Fast