Dolly Parton knows a little about this. Listen to the lyrics of this song. And if you can relate, then exchange the lyrics with "and wrap my little heart around your MIDDLE finger." because that we what we allow when we let people use us.
So don't get wrapped up in that 15 minutes (if he lasts that long) of sex. Hold out for what you truly deserve; a lifetime of love and bliss with someone who feels mutually the same for you.