DILEMMA| My boyfriend really wants me to rim him, I'm not so keen

A reader is concerned about rimming his BF. Our agony uncle gets to the bottom of it.

Dear Uncle,
My bf and I have been together for about a year and we’re really starting to explore what kinds of sexual activities we’re into – and he told me that he really likes being rimmed. Problem is, I’ve never done it and I’m just not that keen on licking his hole, in case it’s dirty.
I want to make him happy, so what’s your advice?
Toby, 20