It's the classic "girl is too poor to pay her bills so she becomes a hooker" story in Half Moon Street. Sigourney Weaver is a highly respected researcher with a low-paying job, but instead of getting an extra roommate or applying for another research position, she gets in touch with an agency and becomes a high-class call girl. Since a lot of her clients are dignitaries, and a lot of them know each other, she also furthers her legitimate career with her contacts.
While Sigourney Weaver might not be the first actress who comes to mind that you would cast as a prostitute, her cool, detached attitude works for the character. During her first appointment, she gets all dolled up, only to look at herself in the mirror, realize she's not being herself, and scrub her makeup off. She shows up in a skirt-suit, glasses, and no make-up. She doesn't use a fake name and actually tells all her clients who she is and where she works during the daytime. It's a very unusual story, since all the other hooker movies you'll watch will feature a completely different character in the lead. If this sort of interpretation appeals to you, you might like Half Moon Street.
Also, while there are quite a few topless scenes, there are no sex scenes. It doesn't glamorize prostitution, but it also doesn't really portray it accurately. Sigourney is never in any danger, or afraid that she might be, and she never alludes to being abused or degraded by her clients. She says to Michael Caine, one of her regulars, that she likes casual sex so she doesn't mind her night job. It's a bit of an offensive statement, since that's never the reason women resort to prostitution. Still, if you like political conspiracy movies, with a bit of sex thrown in, give Half Moon Street a try and see what you think.
