Guys-- is it different to have a hot sister as opposed to an average looking sister?

Red_Raconteur
Two of my male roommates have 19 year old sisters.

One of the girls in question is average looking. Her brother talks about her and when I first met her he introduced her as "My little sister Emma." He seems to care about her an average amount and take an average interest in her life.

The other girl in question is hot. Her brother is always checking up on her, especially regarding her dating life, and is very protective of her. When I first met her there were guy friends meeting her for the first time, and she was introduced as "My little sister Leila, and guys don't you dare try anything, she's off limits." When people comment on her looks he seems proud, but if people (mostly guys) make inappropriate jokes about the things they'd do to her, my roommate gets fairly upset and tells them not to talk about his sister like that.

My 18 year old little sister is hot so I'm fairly protective of her, but I imagine it's a bit different for a brother.
Guys-- is it different to have a hot sister as opposed to an average looking sister?
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