If a girl do first time sex in her life, then is it necessary that she will bleed for the first time.
Does bleeding happens with the every girl,

Question

No. The bleeding at first sex happens if the hymen is rigid and gets torn. Many a girls have an elastic hymen and some have a central hole thats good enough to allow entry to penis at sex
hence it may not break" get torn" at first sex.
The basic issue is trust.
If you trust your partner is a virgin then believe her word for it.
Many a ladies also bleed after getting used to for vaginal sex, due to rough sex or when tears occur in the vagina due to forceful sex. Or when their hormones are low and vaginal lining is dry and liable to getting cracked up
so blood first sex is not the criteria to judge a person's virginity.

Parag Patil · Accepted Answer

No. The bleeding at first sex happens if the hymen is rigid and gets torn. Many a girls have an elastic hymen and some have a central hole thats good enough to allow entry to penis at sex
hence it may not break" get torn" at first sex.
The basic issue is trust.
If you trust your partner is a virgin then believe her word for it.
Many a ladies also bleed after getting used to for vaginal sex, due to rough sex or when tears occur in the vagina due to forceful sex. Or when their hormones are low and vaginal lining is dry and liable to getting cracked up
so blood first sex is not the criteria to judge a person's virginity.

If a girl do first time sex in her life, then is it necessary that she will bleed for the first time. Does bleeding happens with the every girl,