ummmmmmm....... assuming it's in the P4P context, I was going under the assumption the guys was paying for it.
But it does bring up a tangential issue: there are lots of girls who would consider, or actively engage in strap-on play. Now, for "hard-core' guys, they will ask women walking down the street to do it, but for mosts guys, it's not something they will bring up with a woman unless they already know she's up for it. So, there's a lot of potential for this type of play which doesn't occur because neither party talks about it (het, it's gay, y'know.......).
There is a girl who used to bartend at an underground spot where I've thrown parties. She's pretty much a hardcore lesbian, and her only "hetero" sex is for pay. But she does like using a strap on (sidenote: I know for girls; she claims for guys too, but I'm not 100% on that). So, even though she isn't the type of girl I would usually have at one of my events, I invited her and her girlfriend to my last event. I explained to her that it was under the strict condition that she was there to do strap-on shows, not to spend a lot of time in the VIP (The second condition of them coming was that they not smoke before they showed up), and that the whole reason - from her end - was for guys to see her as a strap-on queen, and she would get plenty of curious guys after the party. I told her she'd get calls from guys "Hi. I saw you at the party the other week". And she'd answer "OK, what can I do for you?", and she'd get "Um....... welll.... I saw you with your girlfriend". She'd go "Oh, you want a lesbian show?" and they's be all "Ummm... no..... ummm.........". Point being that guys won't ask for it even if they really want it, so you have to rub their nose in it.
Of course, they both showed up stoned out of their skulls and ended up not doing a single show. And she wonders why I got mad and won't talk to her anymore. (To M: this is exactly the type of shit I was talking about why I don't blame SC management for various things).