Oprah's platitudes are always stupid; don't heed Cosmo's advice, either. When it comes to a summer fling, the more you can lie to yourself and one another, the better off you'll be. If someone tells you to "be upfront" about your intentions, kick sand in their face. That's someone who owns a Friends DVD box set for sure, and you shouldn't take player lessons from people who know the words to "I'll Be There For You."
It's simple, really. Even if your squeeze is on the same page as you are, avoid the whole, "Hey, just so you know, I'm really only looking for a few rolls in the sand and a plus-one to Coachella." See how stupid that sounds? If you want to keep your summer fling going, keep cards like that one close to the vest.