Okay, so maybe this is a non-issue, and maybe I'm just overthinking it.

We've been in the LS for a while now and had some great fun along the way. My wife had her tubes tied a few years ago, so we have no worries about unwanted pregnancy between us. I almost always finish inside her. However, I've read that semen can survive up to 5 days inside the vagina.

We always use condoms with our other partners for PIV play, and change the condom if we change partners, but of course we all know they are not a 100% guarantee. Is there a genuine chance that if my wife and I have sex tonight and tomorrow we play with another couple, the semen inside my wife is still viable and could be transferred to the other wife?

My wife loves playing with ladies, so a double-ended dildo and other toys often come into play, not to mention fingering, etc.