He Can't Stay Hard With A Condom On

Recently I've been seeing this guy, everything was going really well. So we decided to have sex. Right before things got too intense I asked him if he could put on a condom. He agreed but he told me that he has never been able to stay hard while wearing a condom. Low and behold he put on the condom and a few minutes later I felt his penis become flaccid. Once he took off the condom and we started cuddling he became hard again. I am on the pill but I still feel uncomfortable having sex without a condom on. This situation has never happened to me before. Any suggestions on what to do if your partner can't stay hard when he's wearing a condom? Or any suggestions on how to maximize my Male partners pleasure during oral sex?

Sidenote: We used the Ultra Thin Trojan condoms to maximize sensation