If he’s struggling to cum he does this..

Ladies! So I’ve noticed how obsessed my husband is with anal/butt stuff within the last year or so. We’ve been together for 5 years now and he’s never shown interest in it till this year. It has now came to the point if he’s struggling to cum during regular vaginal sex, we will do anal and he’ll cum within a minute or so.. I told him I don’t always like anal, and so then we compromised that he can finger me in my butt while we have vaginal sex. Last night we were having sex and it was taking really long and he wasn’t cumming and all he did was start fingering my butt and he came.. is that weird ? Should I be concerned? It just sucks cause I don’t really like butt stuff as much as he does but I feel like if I don’t give it to him, he won’t have an enjoyable experience ..any insight would be great.