Does your husband let you stick your fingers in his but or toys anything in thay sort ?

I know men have a very sensitive spot in there butt, and its totally normal to do that in relationships its not gay in any way. When im sucking his balls or licking he pushes my head little by little lower and lower but never makes me go down there but he enjoys it sooo much i just feel scared if i go down there with my tongue and he freaks out or something lol. Were very comfy together but i feel iffy about it. Any of your husbands/Wifes/Gf/Bf like this ?