Is it socially acceptable for individuals to wear clothing typically associated with the opposite gender? What are some reasons for or against this practice?

There are many reasons. This can be broken down into the eight broad categories below, though most people only think of no.6:

d) Stunt doubles.

b) In light entertainment: female impersonators/comedians; pantomime dames in British theatre.

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4) Entertainers.

3) Fetish crossdressers - who use clothes as a substitute for, or an essential precursor to, sex. This is commonest among teenage boys, but usually disappears or develops into transvestism later. It is rarely seen in public, although the word "fetish" is often misapplied by those who should know better.

2) Fashion crossdressers - some metrosexuals and most women fall into this category. Women in trousers – seen as a sexual and social aberration in 1900 – had become the norm by 2000.

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c) Drag queens and Drag kings – an exaggerated satirical sub-section of the light entertainment field.

Socially acceptable? It depends on which bit of society you live in.

1) Occasional crossdressers - Hallowe'en, practical jokers, fancy dress parties, students' rags... etc.

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7) Transsexuals – for many of them the cross-dressing is merely an incidental stage in their transition of identity. Once achieved, the wearing of the clothes of the other sex becomes the norm, and can no longer be called crossdressing.

5) Other professionals: the occasional spy/undercover policeman/criminal in disguise. Gay prostitutes.

If it’s merely your sexual fetish — see 3) above — don’t do it in public. You’ll look ridiculous and possible offend decency laws.

The world of the Harry Potter series is usually considered bad worldbuilding. What are some examples of actually good worldbuilding in the books/movies?

a) In serious entertainment, actors playing a role. From Mark Rylance as Cleopatra or Judi Dench as Olivia to Antony Perkins in Psycho. Japanese Kabuki and Nō players. Sopranos singing "breeches" roles in opera.

6) Transvestites – what most people first think of. For transvestites, crossdressing is an end in itself; motives many and various. For most, these go back to childhood or before birth and are obsessive.

8) Those forced into crossdressing. This category is included for completeness but barely seems to exist in real life today. It was however observed in the period 1850-1950 when boys were occasionally forced into girls' clothes as a punishment at school or in the home. It is a staple of fiction – to escape from danger (Some Like It Hot), to obtain a job (Tootsie, Mrs Doubtfire), or forced by a sadistic female relative (much transvestite erotic fiction).

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Don’t do it unless you want to.

Reasons against it? Basically,

If you’re going to do it, do it 100% and do it well. You’ll enjoy it all the more and so will the people around you. It’s often good for a round of applause or a free drink.

Atheists, there is a god up there in heaven and he loves you so much that he sent his son to die the worst death imaginable and then to turn into a zombie all to save you from sin. Why do you reject him?

Ignore people who will quote their religion at you (unless it’s your religion too).

Don’t do it in places where it’s illegal, like Russia.

In Lancaster County, Pennsylvania or Salt Lake City it won’t be accepted. In Rio or Douarnenez at Mardi Gras it’s practically compulsory. (Seriously, I counted the men in skirts in a bar in Douarnenez: one in six.)

Could the guys here tell me how their first experience with a trans woman was? Who was the lady to you? ( I mean girlfriend, one night stand, etc.) I just had my first experience recently and I would like to know about others?