There were once two lovers who loved to try out kinky new ways of sex. The woman suggested they have sex in the park at night. The man agreed

Later that night, the couple hid in the bushes and waited for people to leave. The both undressed in pitch black and the man began kissing the woman all over, then 'moved south'.  After what seemed like 10 minutes the man burst out:

"I wish I had a torch."

"So do I," the woman sighed, "you've been eating the grass for ten minutes."