It's only my opinion, but I find the whole Roxanne/Maggie thing slightly kinky. It's too bad KLS left the series at this point, because I would have liked to see this story played out. If Maggie finally succumbed and became a vampire, would she be in thrall to Roxanne? Would she be Roxanne's "bride" the way Barnabas was trying to make Maggie HIS bride when he first came on the scene? The mind just reels. If they had been able to get Don Briscoe back as Tom Jennings and have dueling vampires Roxanne vs. Tom with Barnabas caught in between somewhere I think the ratings would have gone through the roof and the series would have run several more years.
Sexy female to female vampires with Lesbian undertones go back all the way to "Carmilla," one of the first English vampire stories ...
(And I've just purchased an inexpensive DVD with "Vampire Lovers", said to be an adaptation of "Carmilla"!).
The lesbian vampire theme continues through more recent movies like "The Hunger" and "Embrace of the Vampire."
So yes, I think DS was striving to suggest some kinkiness.
Male - to - Male biting for some reason seems to make some people (usually male) more nervous, where the female - to - female is more socially acceptable.
The only male - to - male biting that I've seen that pushed the boundaries of sensuality was Lestat biting Louis in "Interview with the Vampire." Barnabas' biting Willie on the arm is a first in vampire lore, so far as I know. Seems a rather extreme attempt to avoid any thought of physical contact between males that doesn't fall into the hearty slap on the back sort.