flat fuck:

1. Sexual activity in which two women, or tribades, rub their vulvas together.
Synonyms: bumper to bumper ; clam-jousting ; clit-fight ; doughnut-to-doughnut ; lesbian-love ; lesbian-sex ; sapphism ; tribadism ; tribady ; tribology ; vagina-to-vagina ; venus observa feminae.

2. Or: tummy-fuck , of a male, to masturbate the penis by rubbing it against a partner's midriff .

See Also: fuck flaps

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