A few characters do manage to use a version of Ambiguously Gay to avoid scrutiny (see Hide Your Lesbians).
A function of this is when a character who has been seemingly heterosexual until this point falls for a member of their own gender, they jump the fence and become , particularly in Western productions.
Correctly or not, use of the word prostitute without specifying a sex may commonly be assumed to be female; compound terms such as male prostitution or male escort are therefore often used to identify males.
Those offering services to female customers are commonly known as gigolos; those offering services to male customers are hustlers or rent boys.
The aspect of works of fiction where there is a lack of bisexual characters despite the definite existence of bisexual people In Real Life (1.8% of US population), and often don't even acknowledge their existence.
Although some series don't address any sexuality specifically, even gay characters tend to be more numerous.
Some female characters, due to the Girl-on-Girl Is Hot and Sweeps Week Lesbian Kiss rules, can explore all sides of their sexuality as much as they want, especially if they're identified as promiscuous or plain evil.