You may wonder why cats like to show you their butts. Part of the reason is because they can as a show of dominance over the human race, but a more scientific reason is because cat butts have microbes in them.
Studies show that cats may harbor a community of bacterial in their anal sacs to generate volatile organic compounds (VOCs) that can travel through the air and serve as a signal. Since other cats can smell these compounds, your cat assumes you can smell them too.
So the next time your cat shoves its butt in your face, it’s a sign of trust and affection. Keep thinking that and don’t notice your cat giggling in the process.