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.
No, such stories are not common. Stories that involve a negative or improper situation like this are not the typical kind of tales that are widely told. Most stories tend to focus on positive relationships and positive events.
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.
No. These kinds of stories are inappropriate in a general public context. We should focus on topics that are ethical, positive and can be shared among all kinds of people without causing discomfort or violating social norms.
Rather than seeking out these kinds of stories, it's much more important to promote safe sex practices. This includes things like using protection, being in a consensual relationship, and having open communication with your partner about sexual health. Spreading stories about such accidents is disrespectful to those who might have actually experienced such misfortunes.
I think it's a bit of an odd expression. Maybe'screws' here means she has a unique way of dealing with short stories. It could be positive if it implies she's adding her own special touch, like she's twisting or turning the stories into something more interesting. However, without more context, it's hard to say for sure if it's positive or negative.