Well here's the thing: if you're talking about socially presented traits of a person, you're talking about gender.
If you're needing to use the word sex, it means you're talking about the difference in shape of a person's private parts. The word is exactly as socially acceptable as it seems to be.
If you're trying to compare a bunch of people in a room, like to say you should divide up teams by ___, you probably want gender, not sex. It's medical professionals who usually have cause to care about the sex of a person they know. Unless you're dating someone, and then it is sex sex you're talking about...
If you're needing to use the word sex, it means you're talking about the difference in shape of a person's private parts. The word is exactly as socially acceptable as it seems to be.
If you're trying to compare a bunch of people in a room, like to say you should divide up teams by ___, you probably want gender, not sex. It's medical professionals who usually have cause to care about the sex of a person they know. Unless you're dating someone, and then it is sex sex you're talking about...