My GF says I look hot when I do chores. Is this just a ploy to make me do more chores or is it an actual thing?

It's a thing. There's nothing less attractive than having to play parent to an adult who can't pull their own weight in managing a household.

Can't recognize that a full trash can needs to go out without being told? Can't realize dishwashers that are full need to be run without reminding? Can't find where clothes need to go when they're clean?

If that workload is falling on one person most of the time, over time it can become a source of resentment.

When both people have full time jobs, it's like coming home to a second job.