of questionable taste. 

In a sentence:
Just because Ira liked to rent pornographic movies and play naked twister, who’s to say his hobbies were louche, and not simply the explorations of a very curious dictionary sentence writer?  

In a different sentence:
Karen’s taste in men was too louche, according to her sorority sisters; she actually dated intelligent non-frat types. Like, ew! 

Fact:
Jealous of her beauty and popularity, Hollywood starlets spread rumors about the louche tendencies of Marilyn Monroe, going so far as to claim that she barely bathed.