The speculation of G-spot.
Among experts it has always been a doubt if it really exists or not. It could be a biggest myth if it does not. Some researchers say if it does exist, it’s an extension of the nerves of the clitoris and others think it’s a gland related to lubrication. So, we never know!
The smell changes.
It could definitely keep changing in good or bad way. If the smell is too bad and severe, in some cases, it could be an infection. Don’t hesitate to tell her as then she could start using intimate washes to control it or visit her gyno.
It doesn’t mean she is turned on, but often it suggest that her lady part is in perfect health and your partner is fit.