Why this is possible are many. A woman bleeds during her first sexual penetration because her Hymen is torn away from the vaginal or is torn when penetrated by the male penis. Todays active female may not have her Hymen in tact when she has her first sexual penetration by a penis.
You may be asking yourself how did I lose it or tear it. Do you use tampons? Most likely when inserting the tampon instead of going through the hole that allows blood to drain you broke or tore your Hymen. This is most common and you may not have noticed as most girls experience some pain with first tampon usage.
If you are one of today's more active females. Bike and horseback riding can cause your Hyman to dislodge. Athletics specifically certain types of gymnastics will most certainly cause a Hyman to dislodge.
The fact that you may not have a Hymen to rupture upon first penile penetration does not mean you are not a virgin or were not a virgin. Today's definition of virgin is: Anyone male or female that has not had penis to vagina penetration. As long as you had never been penetrated by a penis before then you were a virgin until then. [ adviceman49's advice column | Ask adviceman49 A Question ]
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