I think the human male has evolved after covid.
So if a man isn't having sex or masturbating then the body has found a way to transfer the sperm into, or mix with, the males saliva. To capture the people who prefer just oral.
The covid has used itself as a decoy, to make the male think the phlegmness of his saliva os covid related, when infact its a mixture of slavers and his pouch juice.