Went for a walk with my new girlfriend and we saw dogs mating.
She said: "How does the male know when the female is ready for sex?" I replied: "He can smell she is ready . That's how nature works." We then walked past a sheep field and the ram was mating the ewe. Again my girlfriend asked: "How does the ram knew when the ewe is ready for sex?" I replied: "It's nature. He can smell she is ready." We then went past a cow-field and the bull was mating with the cow. My girlfriend said: "This is odd. They are really going at it. Surely the bull can't smell when she is ready?" I said: "Oh, yes; it's nature . All animals can smell when the female is ready for sex." Anyway, after the walk, I dropped her home and kissed her goodbye. She said: "Take care and get yourself checked out for Covid-19." Surprised, "Why do you say that?" I asked her. She replied: "You seem to have lost your sense of smell."