We are trying to conceive happily since last 5 months, it is not yet successful though, but Since last month I got a problem. During foreplay and mastrubation, erection is good, but during penetration erection gets lost and thus we can't have sex. Before last month, we were having good sex and also I have not met any changes in terms of medication or habits since last month as compared to previous months. I am not sure whether it is psycological or sexual problem, but I want to get it cured so that we can conceive. Can anybody help me on this?