I've said it before. but for the most part I think Tapastic wants us all to use our best judgement when it comes to swearing and whether or not it should be labeled NSFW.
The internet has become more tame, but it isn't a playground. I think forcing every comic with swearing under the nsfw tag will just limit the comics audience unfairly. NSFW is such a broad topic and if you have that tag it doesn't discern between someone saying fuck or someone being eviscerated with rusty tweezers and a spoon. If parents want to limit their childrens interactions with profanity that is fine, but that is their burden. In the grand scheme of things cussing is really not that big of a deal.
As for the title it just depends, I think like @UzukiCheverie said busy bitches is fine. (It's a pretty good strip as well.) I assume you just want to include a curse word for emphasis and I don't think that will offend people.