no, i suspect its not a moisturizer....or EVER used for even FEM parts, but, she will tell me that, though that will reveal my method of getting info..so it will be at the Big D process. i guess.
You should practice bursting out laughing if she tries this one on you (i.e., it's not for sexual purposes). Tell her, "nice try."
Separately, I want to caution you--some cheaters take gaslighting (making you think you're crazy) to a high art. It is absolutely pointless to get them to "admit" because they never, ever will. Some loyal spouses get very frustrated, spinning their wheels and putting months, even years of effort into pinning down a liar. Step back and realize that the very fact that you have to even CONSIDER doing that is reason alone to walk away.
The best examples on the forum include a woman who planted a VAR that picked up her husband having sex with a woman--denial. Another member had videotape evidence he was at a hotel with the OW from the security cameras. He just said she'd doctored it. Another hired a detective that caught the two kissing after he claimed he was completely no contact--still denied. Yet another member has HPV from "a one-time, long ago BJ"--he failed a polygraph which indicates that surprise! there's more to that story--as far as I know he's still in denial.
Collect evidence, confront, but know when to call it a day.