What's sexier.....
 

#1. You and your wife go to a nude beach. It's very crowded. She lays out completely nude in front of many men with nothing to hide.

#2. You and your wife go to a very crowded public beach. Your wife is unaware that she is experiencing a little wardrobe malfunction and is flashing the whole beach.

#3. You and your wife go to a public beach with a bunch of friends. She decides to go topless. She's the only one. Your friends spend the day staring at your wife's tits.

#3 Would love to see my friends perving over my wife wearing nothing but a tiny thong bikini

#2.

I'm more likely to beat off looking at #1. But #2 is the one that got my attention.