Wow! 5 guys. I saw a disastrous No, No, Nanette with exactly 5 guys in the cast. It was so bad, I'd rather forget it. Why not check the Samuel French, Dramatists Play Service, Dramatic Publishing Company, Tams Witmark, Rodgers and Hammerstein and Music Theatre International websites for suggestions?
Have you considered Really Rosie? It's short, but can be done with a small cast. A My Name is Alice is an all female cast.
When I was in High School, the shows were Of Thee I Sing, Camelot, Cinderella and Down in the Valley. The Fantasticks can be done with women in men's roles. My partner was in it a few years ago. He played the boy's father, and the girl had a mother instead of a father. It worked. The Actor, the Man Who Dies and the Mute were all done by women, and the El Gallo was hearing impaired. It was a terrific production.
Good luck.
NYC Visitor and Broadway Fan