New bf is a bit too adventurous in the bedroom

So my new man obviously has more experience being "adventurous" in the bedroom than me and he told me he likes to have a finger in his @ss and have it licked and asked me if I'd ever wear a strap on for him... so I initially said yes but now I'm panicking because I've never done anything like this and I want to please him but I'm worried I won't be any good