help ladies!!

so my husband likes risky outdoor sex... I hate it, the thought of getting caught scares me shitless I've told him no time and time again but he constantly asks for it, I told him before we got married I will try to do it more but when we go to do it I chicken out and it causes a massive argument! I honestly don't think this is something I can adjust to.. I have done it a couple of times in the past but I really never want to do it again, apart from this we have great sex! but every time I try to tell him I don't want this as part of our relationship he tells me I knew it's something he enjoys and needs before I married him... help ladies what would you do? 😔😔