Hello dear I understand your concern Unable to insertion of penis in vagina could be due to vaginismus Vaginismus mostly due to nervousness of pain during intercourse. So during intercourse there is constriction of vaginal & anal sphicter and perineal muscle. You can take following advises: Insert penis very slowly, once your partner feel pain then stop more insertion and divert mind toward other thing, do some other movement. In starting day you enjoy sex by just inserting glans of penis and gradually increase length of penis insertion. Pregnancy is also possible by just entering glans of penis in vagina. Tell your partner to Breath during mouth at the time of insertion. It will relax anal and vaginal sphincter. Use water based lubricant like K-Y gel during intercourse. It make entry of penis very smooth and painless. Also rule out any vaginal / urinary infection, pelvic inflammatory disorder by consulting gynecologist is problem remain persist. Other things that will use if problem persists: Couple of psychological counselling is given along with pelvic floor training by experts. Medications like Botox and anxiolytic can be use at last. Avoid stress, take healthy diet, drink plenty of water, maintain proper pelvic hygiene and do regular exercise. Hope this may help you Contact further if follow up needed Best regards Dr.Sagar