This type of question pertains to vulgar and unacceptable content. We should focus on positive and meaningful discussions rather than such inappropriate themes.
If it's a story about a pet cat (as 'pussy' can refer to a cat), it's quite normal for friends to like an interesting story. Pets often make for great storytelling topics.
Hentai hairy pussy manga is known for its highly sexual and graphic nature. It often includes exaggerated and unconventional representations of human anatomy for the purpose of sexual arousal. However, such content may not be suitable for all audiences due to its explicit nature.
The origin could be from the darkest corners of unfounded superstition and discrimination. People who are intolerant of the gay community may spread such outlandish tales. It has no legitimate origin in any form of fact - based knowledge, whether it be scientific, cultural in a positive sense, or otherwise. It's a false and harmful narrative.
In a small village, there was a man with very hairy arms. He was an artist. He met a woman who was intrigued by his art. One day, he decided to paint a portrait of her. As he was painting, she noticed how his hairy arms moved gracefully while he held the brush. This small detail made her see him in a new light. They fell in love as he painted her image, and it became a romantic story that was centered around his hairy arms.
If it's an appropriate and positive story, you could continue sharing similar positive experiences with them. But if it makes you uncomfortable, it's okay to let them know that you don't want to talk about it anymore.
There is no scientific basis for such a claim. The male and female anatomies are determined by biological factors from birth and do not spontaneously transform in such a way.