What are some the signs a guy is a virgin?

How can you tell if a guy is a virgin? I suspect this guy I talk to is a virgin but I'm not sure. He seem clumsy and very nervous. He doesn't seem to know how to ask a girl out. He kinda hints at having free time and no one to spend it with. I'm just so used to if a guy just ask me out if he wants and not hint at it.
Lack of eye contact (only with women)
Nervousness
Blushing when touched
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What are some the signs a guy is a virgin?
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