I have to say that this thread got me thinking as well. My lady gets very wet during sex and I find that very erotic and stimulating, both during oral sex and penetration. And yes, I have noticed that she can have a different temperature but have never thought if this was a monthly cycle thing or more due to her state of arousal.
A previous GF was a lot dryer and many sessions reulted in using the lube tube (funny how this is never in the place you left it lol).

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Bucksman
An Ordinary Englishman