Is my younger sister sexually active?

she's 17 and when i was cleaning out the dryer i saw that she has lingerie not the super risque ones but theyre satin and silk. she has lots of lace thongs, lacy bras. they look expensive. and stuff like this
cfile28.uf.tistory.com/.../245D0850541243853240C0
dm.victoriassecret.com/.../V385294_W09.jpg
yes probably
no probably not
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Is my younger sister sexually active?
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