Strain in our sex life

I’ve been with my partner for over 8 years and as embarrassing as this is I don’t let him go down on me even though he wants to and I do too! I would love for him to do it but I always say no or act like “it tickles” to avoid it. I’m just so self conscious and feel like I smell down there…. Not fishy or anything but there’s a musky smell and I hate it! No matter how much I shower there’s a smell and now that I have a baby the smell is more strong. I’m a SAHM so it’s not like I’m out getting sweaty. I wasn’t always this self conscious it all started when my husband use to say comments while joking around that “his balls smelled sweaty and my vagina smelled fishy” but then he’d laugh and say he’s just kidding but why would he comment that? or sometimes he’ll say that there’s a “sex smell” after having sex and it would bother me so much! I’ve let him gone down on me before a handful of times and it would turn him on but I just don’t let him anymore and I know it puts a strain on our sex life. What can I do to overcome this or products I could use to help with any odor? I’m tired of smelling like BO 😩