Well....there IS a splendid little bonus to being married, in that my wife and I know how much tickling does for me, whether I'm 'ler or 'lee.....so, it tends to happen all its own. It was much the same way with girlfriends.
Along the way though, I did know a couple of female friends whose feet I'd tickled/massaged, and they both DID ask me if I'd tickle or rub their feet. In most other cases, my 'ler oriented opportunities were by total happenstance with circumstances being HIGHLY favorable (as were the results!!!!), or..I was 'asked' by more silent means....that being, the feet of any female friend/intimate were simply placed upon my lap.....which can say volumes all by itself.... 😀