If hymen is not boken than is it sure that girl not under gone any sexual intercourse?

If the hymen is not broken than is it a good sign that the girl has probably not had any sexual intercourse, but it is not a guarantee. It is possible that with a not too big penis and a tough and elastic hymen, intercourse could have taken place without rupturing it.

Likewise, the absence of the hymen does not mean the girl has had intercourse. The hymen can be broken in many ways.

Why do you ask?