Yes it is. Back in the days in school, i had many female friends who i was really close with but had no romantic attachment with. I remember one particular one who was probably the closest i had to a best frd (I dont bliv in best frd shit). We were in same theatre crew together and she was d best female dancer i can recall. Had so much fun then, hanging out, going for presentations, going to watch shows, reading together (she was in my faculty too). I know many galfrds of mine who got jealous cos of our closeness. She is at Lagos now working while i recently started working close to my Alma mater. Her kid sis got admission last year and its as if i just adopted her as d kid sis i have always wanted.
So ya, everything is possible. Some things are worth greater than sex.