• – http://www.webmd.com/sex-relationships/default.htm


• – http://www.health.com/health/sex-and-relationships/


• – http://www.sexualityandu.ca


• – http://www.womansday.com/relationships/sex-tips/a4526/sex-by-the-numbers-103274/


• – https://www.psychologytoday.com/blog/strictly-casual/201402/is-casual-sex-bad-your-mental-health


• – http://pregnancy-helpline.net