Bill,

read blogposts, read marketing texts, read the slogans on paysites and you will get that all it basically takes is that you need to exchange "girl" words with "men" words

"this girl shuffs a dildo up her horny pussy to enjoy all the sex she can get. Also she likes cocks from men up her straight ass"

"That guy shuffs a dildo up his horny ass to enjoy all the sex he can get. Also he likes cock from men up his ass"

or

"having a dick in every hole is the best imaginable part on sex. Being able to feel those big cocks plowing through the mouth and my other hole just drives me crazy"

was that gay or straight now? I'd say it depends on the title, the domain and the meta keys/description now and the headline for that very paragraph.
The context differs with the healines 'horny girls want to get fucked' or 'horny guys want to get fucked' or 'submissive slave gets it'

Then you need to learn words like twink, bear, chaser, cub ... but that you will get when reading the blogs and such and when you look through sites like manhunt.com or gayfreesites.com

Dev...