I have read your exchange with Dr Charles, and I see that he has opted out of this question. I will try my best to answer your question, but first please allow me to say what seems to me to be unusual. I am not sure what kind of condom your husband uses, but if it has a special scent or flavor, I presume you have tried to switch to a non-scented condom.
Most condoms do not have a scent that is significant, especially one which lasts into the next day. Has your personal trainer told you that he smells a condom smell? My suspicion is that you may be worried that he will smell it, but he actually does not smell anything.
It is also possible that what you are smelling is semen, and not a condom. This is possible if you have a sensitive nose as you describe. This is difficult to eradicate, but a vinegar/water douche has been used for centuries, and seems to work. However, douching often this way can cause bacterial vaginosis.
Please forgive me if I have to ask you the most obvious question, please understand that I do not in any way mean to question you obvious concern. Why does it matter if your trainer smells the condom? I am really confused, but you're a married woman, it seems like you and your trainer should be concentrating on your exercise. There are so many smells in the gym, I don't see why it should make a difference if there might be a tiny whiff of condom scent on one of the patrons of the gym. Please forgive, I really want to help you, it just seems like there is truly something else that is really bothering you, and I feel like you are not saying what it is.
Please feel free to tell me if there is any way that I can be of further help to you, I would love to help you, Dr. SaulJE