Ads like this are great. Whenever you have a strong, compelling, attention-grabbing image like this, the copy pretty much writes itself. Because when you see this ad, you think, "why is there a guy with his hand down his pants?" (sex appeals, I guess). However, this stopping power makes you read the copy, and if you've made it this far the copy can be as simple as possible and gets the point across to the reader perfectly. This particular ad was so well done.