it looks like a pun, but i can’t work out what for.

Will he sex Tini, or won't he?

I suspect their menu is to puns what local newspaper letters pages are to poetry.

Isn't one of Mogg's children called Sextini?

You are in no way qualified for the depth of knowledge required to dissect the etymology of ‘Willy Sextini’. These mysteries are solvable only by greater minds than ours.

Penis Colada was right there, FFS.