You don't talk about sex DIRECTLY,as in mentioning body parts,intercourse,or what you'd like to do to her.
You insinuate,use innuendo.
Like I once said to a girl....
me:So when are we going out?
her:I have a boyfriend.
me:I didn't ask you if you had a boyfriend. I ASKED YOU when we're going out.
her:We're NOT!
me:Well what if i promise to be good for the first 15 minutes of the date?
I don't want to gone on with the rest of the conversation,this part just about is what I mean.
I asked her would she let me take her out if I promised to be good for the first 15 minutes of the date,thereby implying that after the 15 minutes are up,I would be "bad/naughty.
I didn't say I'd be bad,just implied it.
She knew wht I meant.
That's how you make it sexual.
Remember,sexual doesn't mean vulgar or profane.