What Causes Vaginal Discharge With Strong Odour?

hi, when my husband and i have intercouse he is starting to complain of a burning feeling when he penetrates me and as we are having sex but i dont feel anything wrong im also having a stong odor from my vagina but its only when we have sex. last night he complained again and when he went to wash off he said that he had a film like thing on his penis im very worrie because i feel fine but he is feeling this