Why do I get or*gasms over stupid things?

Ok so I have this boyfriend, and Its really stupid. We were in my room, just tickleing eachother, like a random teenage couple, and I accedently hit him in the b00b. So he as a joke grabbed my vajina (with clothes on) and It felt so good, I can feel my...

panties getting wet. But why do I get like this, so fast, over stupid things. I mean, it was just as a joke, and im also wondering, should I tell him about this?

how often do you do stuff
how often do you mastu*bate?
and how far HAVE you gone?

You are relaxed and comfortable with him. He touched you in a sexually sensative area and your body responded. Its nothing to worry about.

you're not really having an or*gasm. you're just getting aroused