Yes, because it gets hot between your arm and the side of your torso, and the stink in the buildup of normal bodily bacteria is larger concentrations. Fun fact the bacteria in your armpit is the same bacteria that is resistant to Methicillin (MRSA, Staphylococcus aureus.)
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We don't have the organ to sense pheromones, but we weren't going to lose the ability to produce them first.
But also, it's an armpit. A big slab of meat touching one of the hottest parts of your body. It's going to trap heat which stimulates sweating.
Just as a reminder, it's also good to ask "is there any big disadvantage?". Sometimes, a thing evolves traits that don't help but don't cause enough harm to stop being passed on.
Yes, it makes sense
About the stinking, you would better look for these bacteries advantage :)
Hormones are weird. We can smell things we don't think we can smell.
Did you mean pheromones? There is no evidence that humans are affected by pheromones.
Yes, the sweat keeps you cool and the smell attracts others with different immune system.