Elements likely need no further explanation with regard to male masturbation. During ovulation of a female human and estrus of other animals, the individual can become more sexually aroused than at any other time. Adding a dildo and/or an actual penis with enthusiastic action acts just like a kitchen whisk with frothy white discharges whipped up and resembling egg white meringue, mousse, cotton tufts and tassels, or sheep wool:「As a woman's cycle progresses, the mucus secreted from the cervix will change due to hormonal fluctuations. A woman is considered to be ovulating and fertile when the mucus is clear, stretchy and slippery, and looks like egg whites.」
[ https://ic.steadyhealth.com/most-fertile-cervical-mucus 2017-05-03 ]
「Understandably this 'foaming at the mouth' phenomenon has your nerves on edge. But, if you were recently tested for sexually transmitted infections (STIs) and received a clean bill-of-health, most likely the foam-like substance is just a result of the combination of two art forms: The Joy of Sex and The Joy of Cooking. The main ingredient here would be semen…. Semen is loaded with protein, a pinch of sugar, and a dash of salt. The dildo and your boyfriend's enthusiastic 'mixing' inside of you acted just like a kitchen whisk.」
[ https://goaskalice.columbia.edu/answered-questions/foaming-after-sex/ 2017-05-03 ]
Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
[ https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31 ]
The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
[ https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16 ]
Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: to beat with the fist; to hammer
Japanese EDRDG: beat, pound, strike, tap out a message
Unihan extended: beat, pound, strike, throw; shampoo