Louis doesn’t kiss and tell. 

…That doesn’t mean that he doesn’t kiss at all ;}

In canon, Louis did explain to Claudia that sex was, for him, the “pale shadow of killing,” and some other negative things about the experience, but it was probably meant more to try to make her feel better about missing out on it. She would never be able to experience it herself :-

In movie!IWTV, Louis seems to spend his mortal nights getting drunk and hiring cheap prostitutes like have you seen the higher quality ones Lestat hires?! so I would say he’s probably sexing them, I wouldn’t think he’s hiring them for their conversational skills…

I can’t find the same info in book!IWTV, about the prostitutes, but he was getting drunk and passing out in cabarets.