virgins and stds?

Can two virgins having sex pass any kind of std or sti to each other?
Boyfriend says no but I just gotta be ABSOLUTELY sure ya know?
My little sister had chlamydia a while back and took medicine for it and is better but she would often use my towels and steal my razor -_- (sisters, yay)
The doctor said I'm fine but I just thought I'd put the question out there just to be safe.

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