"Rubber Band" joke
"Doctor, my fiance and I are getting married this weekend, and he thinks I'm still a virgin," the woman said. "Can you do anything to help me?"
"Medically, no," replied the doctor. "Try this: When you're getting ready for bed on your wedding night, slide a thick rubber band around your upper thigh. When he enters you, snap the rubber band and explain to him that it's your cherry popping."
On their wedding night, the bride undressed in the bathroom and slid the rubber band around her thigh. The couple then got into bed and began to make love. When her husband entered her, she snapped the rubber band right on cue.
"What the hell was that?" exclaimed the husband.
"That was my cherry popping," she explained.
"Well, could you snap it again?" he moaned. "It's got my balls!"