What is your opinion on this?

my best friend of 4 years (we are like bros) always asks me to give him massages usually back or feet(sometimes legs) and i dont mind doing it for him because i always considered myself straight,but if i was ever going to experiment, it would probably be with him( only because i feel comfortable with him) anyway my question is, why does he always ask for massages (he is 17 turning 18) i know he isnt gay,bi anything. he had a GF for a year.... dont you think its weird?, (like i said i dont mind doing it for him, just curious )