Well, not “sex” in the way we usually think of it. Armand did bite Lestat and drink from him in The Vampire Armand, when Lestat was in a coma in the chapel of a former convent (St. Elizabeth’s) in NOLA (even in that unconscious state, he had been defending himself, but allowed Armand that brief intimacy). 

According to AR, blood sharing is the Ricean vampiry equivalent of sex:

It’s described as being more intimate than human sex, feeding and being fed from is not just about the physical liquid, it’s an all-consuming experience.

When things seem to be accepted as canon/fanon, we get a little playful with word usage… if blood sharing = sex, then we sometimes just use the word “sex” when it doesn’t mean the penetrative sex we usually associate with the word for humans. Keep in mind that there are humans in relationships who are unable (or do not want) to experience genitally-penetrative sex, and they can still be sexually intimate with each other in other ways. So it’s partly in how you define sex and intimacy.

For more on Ricean vampire sex talk, I have these tags: #asexuality, #asexual, #sex, #sexuality, #lets talk about sex.