Psychopharmacology/ drug discovery chemistry-
A drug that triggers feelings of being loved would be interesting. Maybe a drug that has a phenylethylamine or tryptamine structure but binds to mu-opioid receptors, sort of like 7-hydroxymitragynine? Of course, that would just be a lovey-dovey euphoria, it wouldn't really have anything to do with your waifu, not to mention the fact that, as with anything that binds to the mu-opioid receptors, it would be addictive.
Oneirology- training yourself to control your dreams (lucid dreaming) is a way to become much closer to your waifu, and it can be attained with today's level of technological development. The down side to this option is that it takes hard work, discipline, and determination if you aren't a natural at it. There are several herbs, supplements, and gadgets that can greatly boost your chances of realizing you're dreaming/becoming lucid.
Augmented reality contact lenses- Research is currently underway involving placing LEDs in contact lenses with the end goal of contact lenses that can create a layer of augmented reality over physical reality. It will be several years before consumers see anything like this (currently, all that exists is a proof of concept that can only display one pixel), but with them, you could potentially have an augmented reality version of your waifu.
Artificial intelligences that are advanced enough to function as a partner would likely have rights, which could potentially mean a relationship with them would be similar to a relationship with a human. That's just conjecture, though; I'm hoping for the personal companionship humanoid robots scenario myself.
I wouldn't necessarily say that. Every year, a vast amount of knowledge is gained about medical science and human longevity. Without taking into account unfortunate accidents, and provided you don't routinely poison yourself with junk food, fast food, MSG, aspartame, polycyclic aromatic hydrocarbons, etc... we could potentially live a
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