No - make her wait.

Gaining a degree of self-control you step back from the panting woman.

"No, Prof Porter, you can't have my cock because you're such an atrocious whore" you say, "And to prove it you'll turn up at my flat, tonight, at nine, dressed like a whore and begging for cock. Do you understand?"

Her face falls and tears well up, but she mutters, "yes," as you leave the room.