Coulpe in bed, secret lover hiding. (Photo by Peter Cade/Getty Images)





Models simulating a couple making love in a shower. (Photo by News Group Newspapers Ltd)





Unfaithful young man in a cafe. He is embracing his girlfriend and making call gesture to another woman behind her back. (Photo by Skynesher/Getty Images)





High angle view of a couple hugging in bed. (Photo by Stockbyte/Getty Images)





Young couple in bed. (Photo by Alamy Stock Photo)





Backview of an anonymous couple making love, the woman on top, under a patterned duvet. (Photo by RapidEye/Getty Images)





Cheeky young woman having a threesome in bed. (Photo by FantasticRabbit/Getty Images/iStockphoto)





Man smoking a cigarette in bed with woman as she is looking off. (Photo by Neil Beckerman/Getty Images)





Couple sleeping in bed at home. (Photo by Lev Dolgachov/Alamy Stock Photo)





Detail of intimate young couple on bed. (Photo by Le Club Symphonie/Getty Images)





Woman couple relaxing in bed. (Photo by Lise Gagne/Getty Images)





A couple having sеx in bed woman wearing black bra. (Photo by Alamy Stock Photo)





Couple embracing, man touching tip of woman's nose. (Photo by Alamy Stock Photo)





Woman is getting bored on date while her boyfriend is typing SMS. (Photo by Mladen Mitrinovi/Getty Images/iStockphoto)





Young couple being intimate in bed, woman looking away. (Photo by Getty Images/PhotoAlto)





Couple kissing passionately in bed. (Photo by Digital Vision/Getty Images)





Young Couple in bed. (Photo by Digital Vision/Getty Images)





Young couple kissing in bed, close-up. (Photo by James Darell/Getty Images)





Young man taking off the undershirt of his girlfriend. (Photo by Getty Images/Westend61)





Young couple making out on the bed. (Photo by Niko Guido/Getty Images/Vetta)





Romantic young couple at sunset. (Photo by Justin Horrocks/Getty Images)





Couple sharing a sweet. (Photo by Betsie Van der Meer/Getty Images)





Hispanic couple kissing on bed. (Photo by Getty Images/Blend Images)





Couple share a moment of romantic affection. (Photo by Lorand Gelner/Getty Images)





Couple in bed having sеx, 2010. (Photo by Wodicka/Ullstein Bild via Getty Images)