hi your husband had a tight skin around penis attached with frenulum
.This is a normal physiological anatomical situation so don't worry.in child hood if you go for lotion application than it works but in adult age it did not work.you should go for a minor operation known as circumcision
.It is necessary to retract the skin this will help him to reduce pain during excitement & less chances of rupturing small artery
during intercourse.This operation is not painful & usually done in local anesthesia
& takes 15=20 minutes & required dressing for 8=10 days.then after he will enjoy normal sex.In muslim community it is compulsory to go for circumcision of every male child.so it is a normal procedure.have a nice day.