I'm also responding anonymously, but I won't apologize. In fact, I'd venture to say the previous respondent wasn't "sorry" either. But I think if I were making the specific details of ANY medical condition public, I would do so anonymously.
Whatever you want to call me, I've been diagnosed with Antisocial Personality Disorder, Narcissistic Personality Disorder, Personality Disorder NOS, Mood Disorder due to TBI, and, biologically speaking, a large portion of my Orbitofrontal and Prefrontal cortex are literally dead due to massive internal hemorrhages I suffered from an accident in my youth (these are the parts of your brain that. among other things, handle emotions, personality, morality, learning from mistakes, impulsivity, agression etc., and in which numerous studies have shown socio/psychopaths have substantial abnormalities).
First I looked up the word. "Love." It's a noun, meaning it's a thing. That thing is defined by Webster's as "a feeling of strong or constant affection for a person." So let's look at this more closely so we have a full understanding of the question, "What does it FEEL like to be UNABLE to FEEL LOVE?"
Feeling: "an emotional state or reaction" (Emotion: "a conscious mental reaction (as anger or fear) subjectively experienced as strong feeling usually directed toward a specific object and typically accompanied by physiological and behavioral changes in the body")
Affection: "a moderate feeling or emotion"
You can rearrange all these words and meanings like a Rubik's Cube. It's a strong feeling of feeling towards something. Obviously there is a lot of room for personal interpretation here. Glad we cleared that up.
One other thing I want to look into the etymology of here is, "Unable." They made it pretty easy, it just means, "not able to do something." Not able to "do" something? Do: "to bring to pass" "perform/execute." Maybe some will disagree with me, but if anyone was "able" to "perform or execute" their "feelings," that would be pretty weird. It would mean that you could go from legitimately crying your eyes out because you are in emotional pain from the loss of a loved one, to laughing and chatting about that funny cat video on YouTube, without suppression. The "emotions" you were feeling would literally be gone if you were "able to feel."
So before I get to the question, let's just make it clear that no one is "able" to feel love. People feel love or they don't, it's not a skill or ability. And as I've already shown, love really has no definition other than a strong feeling toward someone. Anything else you can find on love is only talking about actions (when you love someone, you treat them this way or do these things for them or listen to their feelings or make sacrifices for them, etc. etc). You don't have to "love" someone to do things for them. In fact, many people do those kinds of things for people they end up realizing they only "thought they loved." Actions can come from love, but they do not define them.
So to answer (I'm ready now):
I'm happy I have the feelings I have, and if someone were to say that my feelings, or what I call love isn't really love, I wouldn't really care. I have my reasons for including people in my life, and you have yours. And if people you want in your life are in your life, then obviously they're cool with it, whatever your reasons are. Keep up the good work.
If fondness means just valuing certain people above others, then yes certainly. I'm fond of people I have a good time with, who can hold stimulating conversation, who have similar interests with. I also admire those who have traits that I desire and aspire to have, or who represent something important to me.
As far as concern for others, I'm going to assume you mean empathy. I can be concerned about people, how or what they're doing, etc. for many different reasons, but if you mean out of sheer empathy for them, then the answer would be no. I have found this to be a non-issue, as I usually arrive at the same conclusions and decisions for logical reasons as most others do for emotional ones. Additionally, I have noticed that the differences between my decisions made out of logical concern, and those made out of other's empathy, are generally better ones.
I'm not really going to get into the sexual question because it's really vague. There's physical sex and there's "making love" and I don't know what exactly you mean by "sexual attraction."
Finally, I do not feel I follow any code, personally. I follow what I follow, and that is determined by what is most advantageous for me. Sometimes following the "rules" is best, but the fact that "Those are the rules" is not a concern of mine. I have to add though that impulsivity is an issue with my condition, so sometimes what I think is in my best interest is way, way off, and if what I thought was best involved breaking the rules, then I end up paying the consequences (sometimes..).
Thanks for the question, it was fun answering.