my boyfriend said he can smell when I'm horny?

Idk about you guys but every time I am horny my man knows, even when I'm trying my best not to show it (since sometimes we are in public.) I asked him how and he said he can "smell" my horniness. I don't know if he is just messing with me but he also said there are key singals he picks up on. That or maybe I'm just really bad at hiding the fact that my panties are soaked ☺️😁