Historically speaking, the usual way to reach aromanticism for males was castration. Less, um, decisive methods included fasting (starving, really), LOTS of praying (getting into an alternate state of consciousness, really), and physically removing oneself from the sources of temptation (poor sheep).
Here's how St.Benedict dealt with it, for example:
Suddenly, the saint’s mind was filled with the memory of a “certain woman … which some time he had seen.” The mere memory of her “mightily inflame[d]” him with desire for her. Then, just as soon as he had been nearly overcome with passion, God intervened. Here is how Pope Gregory describes it:
But, suddenly assisted with God’s grace, he came to himself; and seeing many thick briers and nettle bushes to grow hard by, off he cast his apparel, and threw himself into the midst of them, and there wallowed so long that, when he rose up, all his flesh was pitifully torn: and so by the wounds of his body, he cured the wounds of his soul, in that he turned pleasure into pain, and by the outward burning of extreme smart, quenched that fire which, being nourished before with the fuel of carnal cogitations, did inwardly burn in his soul: and by this means he overcame the sin, because he made a change of the fire.
You want to subvert some of your basic, biologically hardwired drives. If you manage to find effective tools, I suggest that the chance to seriously fuck yourself up is high.
While I agree that there might be some difficulty of overcoming elementary reproductive hard-wiring I disagree with the motivating quote because it seems that hg00 isn't suggesting to go against point 2 in particular.
Several years ago, Alicorn wrote an article about how she hacked herself to be polyamorous. I'm interested in methods for hacking myself to be aromantic. I've had some success with this, so I'll share what's worked for me, but I'm really hoping you all will chime in with your ideas in the comments.
Motivation
Why would someone want to be aromantic? There's the obvious time commitment involved in romance, which can be considerable. This is an especially large drain if you're in a situation where finding suitable partners is difficult, which means most of this time is spent enduring disappointment (e.g. if you're heterosexual and the balance of singles in your community is unfavorable).
But I think an even better way to motivate aromanticism is by referring you to this Paul Graham essay, The Top Idea in Your Mind. To be effective at accomplishing your goals, you'd like to have your goals be the most interesting thing you have to think about. I find it's far too easy for my love life to become the most interesting thing I have to think about, for obvious reasons.
Subproblems
After thinking some, I came up with a list of 4 goals people try to achieve through engaging in romance:
To remove the need for romance, it makes sense to find quicker and less distracting ways to achieve each of these 4 goals. So I'll treat each goal as a subproblem and brainstorm ideas for solving it. Subproblems 1 through 3 all seem pretty easy to solve:
Subproblem 4 seems trickiest.
Hacking Romantic Self-Esteem
I'll note that what I'm describing as "validation" or "romantic self-esteem" seems closely related to abundance mindset. But I think it's useful to keep them conceptually distinct. Although alieving that there are many people you could date is one way to boost your romantic self-esteem, it's not necessarily the only strategy.
The most important thing to keep in mind about your romantic self-esteem is that it's heavily affected by the availability heuristic. If I was encouraged by someone in 2015, that won't do much to assuage the sting of discouragement in 2016, except maybe if it happens to come to mind.
Another clue is the idea of a sexual "dry spell". Dry spells are supposed to get worse the longer they go on... which simply means that if your mind doesn't have a recent (available!) incident of success to latch on, you're more likely to feel down.
So to increase your romantic self-esteem, keep a cherished list of thoughts suggesting your desirability is high, and don't worry too much about thoughts suggesting your desirability is low. Here's a freebie: If you're reading this post, it's likely that you are (or will be) quite rich by global standards. I hear rich people are considered attractive. Put it on your list!
Other ideas for raising your romantic self-esteem:
I think this is a situation where prevention works better than cure--it's best to work pre-emptively to keep your romantic self-esteem high. In my experience, low romantic self-esteem leads to unproductive coping mechanisms like distracting myself from dark thoughts by wasting time on the Internet.
The other side of the coin is avoiding hits to your romantic self-esteem. Here's an interesting snippet from a Quora answer I found:
So, it seems like it's easier for heterosexual male monks to stay celibate if they are isolated on a monastery away from women. Without any possible partners around, there's no one to reject (or distract) them. Participating in a monastic culture in which long-term singlehood is considered normal & desirable also removes a romantic self-esteem hit.
Retreating to a monastery probably isn't practical, but there may be simpler things you can do. I recently switched from lifting weights to running in order to get exercise, and I found that running is better for my concentration because I'm not distracted by attractive people at the gym.
It's not supposed to be easy
I shared a bunch of ideas in this post. But my overall impression is that instilling aromanticism is a very hard problem. Based on my research, even monks and priests have a difficult time of things. That's why I'm curious to hear what the Less Wrong community can come up with. Side note: when possible, please try to make your suggestions gender-neutral so we can avoid gender-related flame wars. Thanks!