Seen by the male partner when engaging in mutual oral sex ("69"), this term describes the effect of the female partner contracting or tightening her pelvic muscles during sexual stimulation, which causes her anus to contract or 'wink'.

Sometimes used a signal to the male partner indicating that whatever he is doing is having the desired effect and is easing the female partner towards orgasm when vocal expression is impossible due to the attention she is giving to his penis.

As orgasm is achieved the 'winks' will become regular and very obvious contractions until orgasm subsides.