Did you know that the feeling of desire kicked up when flirting is the work of powerful hormones including serotonin, oxytocin, vasopressin and endogenous opioids?
"My body apparently had a mind of his own, because my barstool was going to need sanitizing when my knees stopped being too weak to stand so I could get up and run away."
I wrote some sex scene short stories as part of a dare once. I find that if you picture someone you know and have desire for and then write a story with you and them in mind, it sounds more realistic.... heh