What is causing this to appear?

Hi, I'm 17 and I'm very hygenic something like my body. I love to take Showers and Baths. I steal showers but day and hours of darkness. Every time I get up from sitting in a plastic similar to chair, and I look contained by the sit, there's resembling a Moist looking line. It's not damp like and it's not dry resembling I can't describe it. It's not my jeans or anything because I always draw from a size bigger than my normal size. Is it because I'm sitting down to long or what? The other girls in class draw from that. How come I have this?
Answers:

Hey girls, have this happened to you?

To me, it sounds almost approaching it's sweat. Your body is hot, and plastic is a good insulator, so it's nature of like when you wrap something hot up in foil to hold the heat surrounded by. The heat from your legs etc are warm the chair up, and consequently making your legs even warmer, so it's sweating.
Like how if you sit in leather places in the summer.
I hope that help.

Had a hysterectomy in 94 started bleeding 1 month ago still enjoy ovaries what does this mean..be to Dr.?

huh? o dont think i obtain that

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It's probably condensation because you are a heat body sitting on a cool seat.

After the removal of uterus and ovary what are the sexual problems?

It's because that element of your body is naturally moist. It's totally run of the mill. If it's hot out it can also be sweat. It is not a sign of uncleanliness in any way.

Aggravation?

Its sweat dear, everyone get it, they are plastic chairs! what do you expect? lol trust me i get it to, nil to worry nearly :P