Homosexual behavior does occur in the animal kingdom, especially in social species, particularly in marine birds and mammals, monkeys and the great apes. Homosexual behavior has been observed among 1,500 species, and in 500 of those it is well documented. Georgetown University professor Janet Mann has specifically theorized that homosexual behavior, at least in dolphins, is an evolutionary advantage that minimizes intraspecies aggression, especially among males.
Do animals "just choose"?
We're nothing more than animals so prove to me that they choooose just for attention / to be noticed / whatever.