Asian massage parlors and latina brothels in Maryland. The provider takes off the mask when a cbj is performed. They wipe down the client with disinfectant wipes.

Bachelorette party during the pandemic?

(Photos posing with N95 masks as a bra and bikini bottom.)  Interestingly, the invention and design of the original N95 came from the bra itself. What goes around, comes around.
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http://www.fastcompany.com/90479846/the-untold-origin-story-of-the-n95-mask
"But the late ’50s were tough for Turnbull, who spent a lot of time visiting sick family members in hospitals. She lost three loved ones in quick succession. And out of that grief came a new invention: A “bubble” surgical mask that 3M released in 1961, that yes, takes its inspiration from the cup of a bra."

Using two condoms in not twice as safe as one.  In fact, the friction between the two condoms can cause them to tear, thus making that gambit much less safe.   This according to some article I saw posted on her some many years ago.