Sadly, once it's gone..I think it stays gone. First, don't resort to porn. All it does make you further realize all the fun shit that others are getting and you aren't. Reason, I say it stays gone is cause it mellowed for obvious reasons..kids now there, she's tired, baby is in the room. You get started, baby cries. They are things that'll continue to be there. Role playing is stupid. Toys are cool for a moment. Sadly a piece of strange is the best answer, but I dont suggest that. Introducing another person if she's into it. Aside from that, I dunno how it comes back.