Is It Bad To Have S. E. X. ?

okay so im 14 and ive been with this amazing guy for a while now hes 15 but the same grade, were gonna be going into highschool, he lives in a differnet town than me but we still make plans so i can go there and we can see it each other, but were serious and truelly love each other and were thinking bout having sex, but a friend of mine said no we shouldnt unless i would like to become a super slut.. so now im confused and no he isnt pushing or rushing me, we thought bout it and talked bout it. answers please?