I cant give you a diagnosis because this site doesnt allow members to make diagnosis or tell each other what is going on with in someone elses body.

what I can tell you is that many asexual people do gravitate to sexualized movies, books and websites and ask those that they trust about body part issues like your friend did to you.

the reason the people I know have and do these things is because they dont feel it their self. they need role models to show them what it is like,

let me give you an example if it was freezing outside and you could not feel that at all and you went outside in say a skimpy bathing suit in the middle of your friends, family and strangers what would happen... you would feel out of place, get stared at and others would avoid you or focus their attention on you.

but if you researched this by watching movies and reading books and asking those you trust about touching ice and snow, touching their body so that you can see what cold feels like on another and how others react to freezing cold, even though you do not have the ability to feel on the emotional level you can now fit in with out being conspicuous/ drawing negative attention from others.

many asexual people want to fit in, they want to know what sex is all about even if they can not feel it their self. so that they can fit in with their peers, friends and family, discussions of sexual nature...

another reason asexual people do what you posted is because it may be part of their treatment program. many asexual people are not asexual from birth, many times it can be a result of trauma where because of the trauma their brain has turned off and wont allow them to feel and associate with others on a sexual level. sometimes doing what your friend asked can open the mind back up to where they can learn there is enjoyment, not just numb, no feeling and repulsed by it.

another reason asexual people I know do what you posted is because they get a non sexual reaction called euphoria from it.. like a self injurer will self injure and the brain releases endorphin's into the rest of the body which causes a calming relaxed feeling. sometimes asexual people just need to feel ....something.... that makes them feel human.

also its completely normal for human beings to be curious about things even about things that they are repulsed / disgusted by/ or makes them uncomfortable.

my point there are many reasons why your friend may have said and done what they did and only they can tell you the whys and hows their asexuality works differently than yours or others you know who are asexual.