the gentleman's tip 

The sex act where a man, upon receiving a woman's permission, inserts the index finger (no further than the middle knuckle) into the woman's anus during vaginal intercourse, and gently slides this portion of the index finger back and forth.

We find ourselves in the midst of a conversation between Jane and her friend Sarah that has stumbled upon the topic of anal sex, let's observe.
Jane: James has been asking for it forever, I don't know Sarah, like, I think he could be the one. What should I do?
Sarah: just have him start slow, with "the gentleman's tip" and work your way up from there

the gentleman's tip by JuiceBox89 January 28, 2015