Gf &BF??Sex on a subway?!?

The title was just to get you to open this. okay i will make this as short as i can. I like this guy he likes me i want to hang out and be friends (Like comeover get to know eachother more do stuff friends do )b4 we actually date(because bestfriends/friends realtionships usally lasy longer). My question is how can i get that type of friend realtionship b4 we date? plz and thank you for your kind and thought ful answers