And there's definitely some relief mixed in with the excitement that (inevitably) trickles through him. It might not change things that much, but sex is the best way he knows to feel close to someone and, hell, even if it doesn't do that at least it's got to be more fun than getting frustrated trying to talk to each other!
"It's a date, then," he agrees, with an incline of his head, and then grins, wickedly. "Try not to wear yourself out too much with Ianto tonight, eh?"