First love

Miya
So I've never posted anything on here before and  I would really love some feedback. 
I'm in my very first relationship and were a month away from being together for a year which is so great. I've been contemplating about sex in our relationship. I'm still happily a virgin. And even though he is not, he had done a remarkable job of respecting my values and beliefs. I guess my question is.. When will you know it's the right time? Knowing I'm an emotional person I don't want my drive to be just emotion... 
How would you approach this?