We had major problems with condoms when my husband had ED. I can't use hormonal BC so we did condoms and the pull out method. Now that my husband has rebooted and his ED is gone he can use condoms no problem. Luckily he just got a vasectomy so no more condoms for us anyway.
I think condoms don't work too well because of lack of sensitivity. My husband couldn't feel anything with them on. The longer he went without masturbation etc. the more sensitive he got to where condoms were fine.