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."