I can't wait to see it again; those were some good thoughts, Curtain.
The women never question Nick falling in Love with a Shark, just that he is falling in love at all. I sort of think that because it's a play all about unconventional love, and to be honest, that's basically (no offense at ALL intended) what Carla Carla and Donna have. Who would they be to question Nick? They do at first, (the scene on the bench - "nice looking cute or nice looking nice...") but after that they live and let live.
I love that the play is a really different way of conveying a sort of obvious, but sweet message.
A work of art is an invitation to love.