The presence of any type of mask is effective in reducing casual virus transfer by hand contact between the mouth, nose and eyes - these are the infection routes for contact infection. The penis and vagina are also contact points for infection, so make an ad-hoc mask,
Here is one that works because shop towels ar a lot better than paper towels.
https://www.youtube.com/watch?v=mai-UqdNRi8It also helps block breathing in or out of droplets