Well I think the age to have sex is whatever the age of consent is in your area. In the UK it's 16 years. You really shouldn't be having sex at 13,14 or even 15 because if you did have sex at that age you are breaking the law, but you probably wouldn't be punished for it. BUT - if you are 16+ and have sex with someone under 16 you are seriously breaking the law and may find yourself serving a sentence for a sexual offence. I'm sorry to be so boring, I just thought I'd educate some youngsters. ALWAYS use a condom. There's no substitute, not using one may land yourself with a child or sexually transmitted diseases (STDs) or a really serious disease AIDS - which kills.
In life you\'ll often find that no answer can be 100% and that sometimes nobody can ever give you an answer that you find acceptable.