Never have sex with a girl unless she's sent you a text that proves the sexual relationship is consensual beforehand. And it's a good idea to even follow up any sexual encounter with a tasteful text message saying how you both enjoyed being with one another -- even if you never plan on hooking up again.
http://www.cnn.com/2013/11/26/opinion/jones-sex-consent-texting/index.html?hpt=hp_c3
How to protect yourself from false rape allegations is a constant conversation among professional athletes. I've covered many rape cases over my career, including those of Kobe Bryant, the Duke lacrosse team, and many others that never made the headlines. Sports agents and athletes have tried everything from openly or secretly recording their sexual encounters, which is illegal in some states, to asking all women they have sex with to sign a pre-consent form. And though the public may scoff at stories of athletes who frequent strip clubs or solicit prostitutes, many athletes say they do this to avoid unwarranted sex assault charges.