Is she masturbating? That would cause it obviously. She could be extra sensitive down there. If it's happening without any stimulating, then it might be best to see an OB-GYN about it. They've seen and heard it all before. Orgasms cannot hurt you though.
Females can be easily stimulated. A woman cwn orgasm just by seeing someone. NO it can not break your hymn at all just penetration can.
Nothing have entered her at all but she rubs over to get into orgsam....