There’s this real funny “vet joke” about two women — each of them with a dog — who have a conversation in the waiting room of the local veterinary.
One of them (a redhead) tells the other woman that her dog — a small white poodle — has the annoying habit of jumping her from behind in an aroused state whenever she is cleaning out the bath. So she wants the vet to castrate her dog. The other woman (a blonde) says that her dog — a large German shepherd — does the exact same thing when she is on all fours.
“So you’re here to have him castrated as well ?,” asks the redhead. “Oh no,” the blonde says: “I’m here to have his nails clipped.”
Anyways, dogs often greet through sniffing each other’s crotches and behinds because the smells they smell yield valuable information about the other dogs through pheromones — strong-smelling chemical signals which render details about health, emotions (such as aggression), diet or reproductive status (such as menstruation and ovulation).
And that’s exactly what they do with humans — regardless of whether the humans are female or male.
Them smelling you down there is totally similar to asking you how you are doing. The only difference is that we humans often lie when we answer this very question —