Does belly worship mean someone has a preference or fetish?

The topic of body preferences came up early in my current relationship with my (f) bf(m). I asked him because our level of intimacy was very low for the longest time and I saw some old dating profiles where he was seeking bbw and ssbbw women. Those two things lead me to question if he was sexually attracted to my body. I know he liked my personality and character at least.

Anyway, I did not go into detail what I read on those old dating profiles but I saw he liked something called belly worship. I am not sure why my bf isn't able to just tell me this in person. Is this something people feel ashamed about?

A part of me feels like he worries if he shares this I will just have one more thing to bug him about as to why we don't have much sexual intimacy together. He usally just tells me he finds me attractive and to trust him and not take his low libido personal.

What I am curious about is, do people who engage in belly worship during sexual activity with their partner consider it a preference or kink? To me it seems if someone goes as far as to worship a part of someone's body it is an extreme need they require to become aroused. Am I misguided on this? Please help me to understand.

*If your partner doesn't have a big belly what substitutes for it? How can me and my bf meet in the middle on this? He has ED from health issues and mental health issues so I reason in my anxious brain maybe if I was more his body type it would help him hold an erection.

For context he has went to the doctor and made changes to his diet and it has helped a bit. However, he also expresses that in his past he had a lot of sex while on drugs to help him be less anxious, so he could preform. Now that he's sober he struggles to be present and also feels like he got used to intense sex and doesn't know how to have slowed down sex.

Thanks