Yes, Douseiaisha is literally a homosexual in general. Douseiaiteki would be 
homosexuality. As the kanji would indicate, the characters would mean "same 
gender love."  If I were to guess at the English translations into 
non-katakana Japanese, I would choose Douseiaijo (female) and Douseiainen 
(male) Given these are a mouthful for casual conversation, however, I would 
assume that there are slang terms out there, but what they are I don't know.

Just thought I'd add my 2 cents in since I came across these terms in 
materials for my Modern Japanese Lit. class. My humble apologies to the 
admins if this is beating a dead horse.

- SD

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