What is the effect of Covid-19 pandemic on sexual function?

The guideline says that your safest sexual partner is Yourself, Masturbation will not spread Covid-19. With these critical days with many advice for social distance and washing hands and 6 feet distance with people how we can have sex?

While the U.S. Centers for Disease Control and Prevention and World Health Organization, two authorities on containing the virus, have abstained from offering explicit advice on how to handle intimacy during the pandemic, other sources have offered some basic protective measures people can take when they’re feeling the urge.
Dr. Carlos Rodríguez-Díaz: There is no evidence that the Covid-19 can be transmitted via either vaginal or anal intercourse. However, kissing is a very common practice during sexual intercourse, and the virus can be transmitted via saliva. Therefore, the virus can be transmitted by kissing. There is also evidence of oral-fecal transmission of the Covid-19 and that implies that analingus may represent a risk for infection.
Meeting someone new? Not so much.
Jumping on a dating app, hiring a sex worker, or other ways of connecting with strangers to pass the time in quarantine is not recommended unless you do it virtually.
Video dates, sexting, reading erotica to each other over FaceTime, and dropping into chat rooms are all approved as alternative options to hooking up with someone outside your self-isolation zone.

Covid-19

Many sex workers have moved their services online and can be supported through services like Patreon, OnlyFans, and various cam sites.
These days in Quarantine time, fears, anxiety, bad news, not to be good looking, not having good body image, not to go to Bar or public effects to the mood of all people is a kind of less libido& less sex because of bored at home, but in another side, because people staying home without a job they need to have sex with their primary or regular wife or husband or partner.
Since sex relationship affects the immune system, and boosts immunity against virus infection, avoiding sex is not recommended.
So, a kind of Monogamous sex seems will be the safest one.

I have done lots of studies of stereotypes of single people. Terri Conley and her colleagues have been studying stereotypes of people who have what they call “consensually non-mongamous” (CNM) relationships. We have each gone on to answer the next question: Are the stereotypes true, or are they mostly myths and prejudices?
Conley likes the CDC definition of monogamy: “mutual monogamy means that you agree to be sexually active with just one person, and that person has agreed to be sexually active only with you.”
Consensually non-monogamous relationships (CNM) are “relationships in which both partners have openly agreed that they and/or their partners will have other sexual or romantic partners.”
Polyamory involves “having consensual loving and romantic relationships with more than one partner.” That’s different from swinging or open relationships, in which the relationships maybe just sexual and not necessarily loving or romantic.
But in Pandemic time, having a multi-partner is very risky and not recommended.