Yesterday I was kind of having a dilemma.
My books are teen fiction, and I was trying to decide whether or not to mention or insinuate sexual references, but after speaking to my husband I decided I will steer clear. Mainly because my eldest child is only 11 and she loves reading my work and eventually my 5 year old will read it and as a mother I wouldn't want my child reading  anything like that, until they of an appropriate age.
I know my eldest has read Twilight and there has been subtle references, but done in a way that is okay. So maybe in one of my later books I may subtly mention something but its hard to know how to write it.