I'm working on a website targeted primarily at women. In several places we
need to ask for information about the user's significant other. 80%+ of our
visitors are straight women, but we do get the occasional man (gay or
straight) or gay woman.
The team is debating which pronoun to use in field labels - e.g. "Their
Birthday" or "His/Her Birthday". The site has a pretty relaxed/informal
tone, so we're leaning heavily toward "their", but we thought the list might
have some opinions to share.