Birdandsparrow
Here's a crash course in what 'autogynephilia' is:
Autogynephilia is a male's paraphilic tendency to be aroused at the thought of himself as a female. A 'paraphilia' means 'recurrent, intense sexually arousing fantasies, sexual urges or behaviors generally involving nonhuman objects'.
There are four different types of autogynephilia which may occur completely, partially, or in combination with other types (complete or partial):
Transvestic autogynephilia: arousal to the act or fantasy of wearing typically feminine clothing (this is what people often mean when they talk about autogynephilia, but it is much more nuanced);
Behavioral autogynephilia: arousal to the act or fantasy of doing something regarded as feminine, also covers 'interpersonal autogynephilia';
Physiologic autogynephilia: arousal to fantasies of body functions specific to people regarded as female (there's some way-out stuff on the Internet of males getting a kick from pretending to be pregnant); and
Anatomic autogynephilia: arousal to the fantasy of having a normative woman's body, or parts of one (breasts are a common fantasy, ofter the autogynephiliac will want breasts but to keep his penis and testicles, this is an instance of 'partial autogynephilia').
Autogynephilia can also be compared to being a sexual orientation.
Here's a piece I wrote taking something someone else has written and pointing out the real world instances of autogynephilia the author was (unwittingly) describing:
'17 signs I am an autogynephiliac and didn't know it'
I think it's always good to look at real world examples as it makes the topic easier to understand and it also demonstrates the phenomena does exist.