Everything happens in context, right.
Senario 1: Hey, single girlfriend, my husbands working and I fell like going out. How about I get a baby sitter and we go out Saturday? ( Then, when I get home I can lay my horny ass on him.)
Senario 2: Hey, husband, since you're working how about I and my single girlfriend drive all day and dump my kids with my Mom and get real fucked-up for two days,leave without saying goodbye and bitch her out when she asks me what WTF is up? (Is there a living person that wants their mother to see them this way on a family visit, that isn't crying out for help or attention or something?)
Oh yeah, and the difference between sluts, tramps etc and most of the rest of us is discretion and judgement. It's not the "weekend" it's the context that says that more is going on here than a few magaritas and a dance.