Is it normal for a girl to fantasize about all her girl friends?

I might be married and love my husband's d#@k but honestly sometimes nothing is better than hitting the bed with another girl. I actually have a friend who my attraction to started kinda like yours, ours was in a hot tub in my back yard tho, and now every time my husband has a business trip and is out of town, she's over at my place for a night or two