One more totally harmless barely noticeable readily available "toy on the fly" would be my personal fave: the Sharpie. I can write pages and pages on this amazing invention. Not the end with the cap, the other end.. the regular size is thin, small, perfect size of a finger or so... great for teasing clit and pussy. Even perhaps for toying with the ass a bit. Then, let me tell you... that Super Sharpie. It's larger, still rounded on the end, and a bit more filling. More like a small dildo would be for vaginal filling, and one of my best guy friends has great fun with me, the Super Sharpie, and my ass, especially while he's giving me oral and/or using some of the other toys. Not to mention, there's no sound since it's silent, and they're easy to clean OR... after one session of a few uses, cheap enough you can throw them out and no one will ever think anything of it or even notice, if secrecy is key. Oh, and you could easily slide one from the nightstand (or wherever) and casually suggest or tease about using it and see how the hubby reacts. I wish you luck with that, though. I'd guess not being compatible sexually would be incredibly challenging. My two cents. So many great suggestions on this thread!