Don't take chances. Use condoms and check for diseases. There is nothing wrong about having a healthy sexual appetite, nor is there anything wrong with having no desire for sex. And if you don't feel like having sex, make that point clear. You do not have to say yes, just because someone else is begging you.
Rape is wrong.
It is also a felony, punishable by years in prison. If someone is forcing sex on you, defend yourself. Scream at the top of your lungs. Disable the agressor if you can or escape. Attack with full force to get the aggressor away from you.