With out sex it is hard what is the problem what to do please any one suggest.

Hi, we are trying from 1 year for children but no pregnant our main problem is when we are having sex my husband penis was not going in to my vaginal but 1 finger was going 2 fingers was not going we have tried but no use and another problem is when we are in sex penis was going soft. With out sex it is hard what is the problem what to do please any one suggest.