well guys, let's not forget shagging doris was technically part of his (admittedly verbal-only and presumably unofficial) contract
combine that with the fact that the dude's 10K+, offhandedly mentions that sleeping with him probably ain't all that great, and has some kind of canon attraction toward doris (good ol' lefty even drops a few smartass quips about it and is promptly told to can it), and i think it's a reasonable assumption that, assuming the townspeople didn't mob up in the yard and also assuming doris wouldn't have gotten cold feet, they definitely would've had a go in that one scene
'cause i mean, doris came at him levelheaded and with all the intent in the world, and he returned the kiss before the mob turned up
so we know he's at the very least not above imbibing--it's not like being a dhampir would automatically kill sexual urges in every capacity, they are still half-human (and given how in-depth kikuchi explains how the fifty-fifty biology split works, i see no reason to assume dhampirs would have absolutely zero sexual urges in all situations; d just gets a pass because he's so damn old that the idea of a human-level relationship probably isn't ending in anything but heartbreak on account of being guaranteed to outlive them)
though, to be fair, it's explicitly stated that the bloodthirst peaks rather strongly for doris--something we don't see too often despite having a new exceptional beauty almost every book whom d inevitably finds himself alone with and just as frequently in various states of physical/emotional vulnerability--but considering that he made it a point to push her off the first time when it was bloodthirst (even after it was made clear that she knew and offered herself to his mercy anyway) and also made it a point to not literally push her, naked, off his straddled lap pre-angry-mob, methinks there's at least some level of human-level attraction there
he might be a ten thousand plus year super dhampir, but i'm fairly confident in the likelihood that his dick still works
basically he's connor macleod--not above trysts or relationships, just been around long enough to know how it's almost definitely gonna end, so why bother with that pain 95% of the time