As a guy, I would think it has to be more involved for the female to get ready for PIV sex. It's not like you can just shove it in. And....after it's over she's oozing out cum for the next hour or so. Quick and neat with a hand job.
Sorry I'm another guy but personally I'd rather wait for PIV later than a rushed handie now.
That said, I've had girls that were down with a quickie before heading out. How they dealt with the aftermath I'm not entirely sure but I've always owned bidets so I'm sure they managed fine.