When you're in a relationship, do you care your significant other hangs around friends of the opposite gender in their underwear?

For example, if your girlfriend was hanging around out with her male friend in her underwear, do you consider that too intimate or is not a big deal to you? What if your boyfriend was wearing only boxers (or briefs) around around a female friend? Does it depend on context?

Why is it different then hanging out in bathing suits?

When you're in a relationship, do you care your significant other hangs around friends of the opposite gender in their underwear?
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