back of a spreadsheet; back of the net

Yesterday evening on the way home from mannnig the box office for my theatre groups show I *think* I overheard this snippet of conversation between two University age kids

“…it’s for when they do anal to your face…”

Now, I’m not naïve enough to think a twenty year old guy and girl won’t be sitting outside Starbucks talking about anal sex. Hell I was doing exactly that nearly 20 years ago, except that we didn’t have Starbucks (Kids, once upon a time if you wanted to talk about anal sex you had to go to the pub.)

What baffles is me is that the line makes no sense and I can’t think of a way that I might of mis-heard the line that does make sense.

So my question for the internet today is – what could that snippet of speech actually be that that I could mis-hear it as

 “…it’s for when they do anal to your face…”

?