Again, it's important with all of these questions to make him feel as though he can safely express himself honestly - this is not the time to be judgmental, and certainly not to run a guilt trip about anything.
It is important when listening to guided relaxation that a person not be judgmental or critical of the instructions.
Possibly the hardest part of sensuality is that judgmental voice in your head that will try to second guess what you're doing - whether you're doing it well enough, good enough, or whether your body is pleasing enough.
Get informed before you make any decisions about sexual relationships, if possible, and remember there are adults who you can talk to and who will answer your questions without being judgmental.
Children at this age are often less judgmental and more accepting of someone that is different from them because the social stigmas and ill-conceived notions of conformity are not important.