Hello thanks for asking from HCM for your health related queries I can understand your concern. You have mentioned that he is not able to insert in vagina and loses erection during penetration. This shows that he is getting good erections but is not able to sustain erections because of delay in penetration. This also rules out any serious cause behind his problem. To enjoy a good sexual life both of you have to try simultaneously. You have mentioned that the vaginal opening is short so this should also be dealt properly. Try to spend a lot of time in foreplay and if possible ask your husband or you can try yourself also, to use finger to dilate vagina prior to intercourse. Use a good lubricant like KY jelly which would help in easy penetration. After using fingers and then a good time in foreplay he will get hard erection and will be able to penetrate easily. Some times in more severe cases medicines are needed. PDE-5 inhibitors like Sildenafil or Tadalafil can help him in getting long erections. These drugs can be used on prn basis about half to one hour before intercourse. Please consult a psychiatrist for the detailed prescription of these drugs. Thanks, Hope this helps you. Take care Dr. Seikhoo Bishnoi, Psychiatrist.