system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is a Hot Shower or a Hot Tub so Amazing, While Hot Temperatures Outside are so Miserable?

The optimal temperature for a hot tub is 98-104 degrees Fahrenheit, and I take scalding hot showers as well, probably at similar temperatures. Both of these things are extremely relaxing and just feel great overall. However, being outside for even a couple minutes in similar temperatures are just miserable. I know this probably isn't true for everyone, but I'm sure the vast majority of people could get on board with this. Why is this the case?
gpt
Possibly 2 factors:

1. You have *complete control* over the temperature, which makes you more willing to withstand it. In a similar fashion, we know that people will subject themselves to much higher pain thresholds when they know they can stop it; but if they feel like someone *else* is making the decision, then they freak out even at low increments. So, psychologically speaking, you are 'choosing' the temperature, rather than 'putting up' with it.

2. You're (presumably) naked - or almost naked - in the shower / bath. You don't have to contend with sticky clothes, picking up / moving things around, or looking presentable for other people.

EDIT: To the kind people up-voting me; please upvote some of the *other* comments in here, too! There are some great responses about humidity, heat transfer, etc, that really deserve a spotlight. It's perfectly fine for there to be multiple correct answers :-)