Are you planning on being suddenly and inexplicably traumatized by the experience? If so, then sure, ‘fess up… a potential partner should know that you’re likely to be an inconsolable wreck after.
But if you’re just going to have well-lubricated, consensual sex with someone you aren’t ashamed to know, then child, get your fuck on and keep your (lack of) history to yourself. If you’re enthusiastic, he’ll never know the difference, and if you’re open and enthusiastic, he’ll be too delighted to care.