for me it's possible for a gal and guy be a good frenz..
coz i have few girls which is my best friend that also best friend with few guys..
we never think anything related to sex when we all together.. (except joke lah, that one sure always). we all always sleep together... n normally the guys only use their boxer n we didnt feel guilty. n often for us to call them wake up in the morning by going to their room... n they just wearing their boxer, underwear or sometimes naked.. n we just feel nothing... maybe becoz we very close since we are form 1.