[ True, another day would be best, especially since he hadn't even spoken of that particular reasoning with Spock and Bones. He simply didn't discuss things like that with other people. He never had. He had learned, early, to repress those things and work through them. Speaking them... well, it wasn't worth going into. ]
Even if you don't have sex, relationships can get messy.
[ He's rolling his eyes very hard, but shudders when his fears are confirmed. ]
Guess it's a good thing I didn't go in for a kiss earlier.
[ And he had been very tempted to, make no mistake Jack Harkness. ]