Thinking of the same concept used in the "Empowered" comic book series.
http://www.stardestroyer.net/AOTC/Revelations-1.html
http://en.wikipedia.org/wiki/EmpoweredNumerous attempts have been made in order to shore up the genetic interpretation despite its deficiencies:
1. "The Jedi Order was forcibly suppressing the evolution of Force skills by abducting Force-sensitive children into the Order and forbidding them to reproduce, hence their continued rarity (this idea echoes a plotline on Babylon 5 in which normal humans tried to control a developing telepath population with a targeted bio-weapon)." This is an interesting idea (particular for the cynic in you), but it is simply not realistic. Neither the Republic or the Jedi Order could have forcibly suppressed this evolutionary development everywhere in the galaxy, since they obviously don't even check for Force skills in the entire Outer Rim region (as we discovered in TPM). Moreover, at 25,000 years old, the Jedi Order may seem ancient to us, but it's a flash in the pan on evolutionary and astronomical timescales. In a galaxy with millions of sentient species, some would have undoubtedly developed this trait hundreds of thousands or even millions or billions of years ago, long before the Jedi existed, and it would have become dominant. Did the Jedi exterminate entire worlds in order to suppress Force skills? Pogroms and holocausts on an unimaginable scale, in order to prevent the genetic hegemony of Force sensitives who would (oddly enough) command galaxy-wide respect and fear as the Jedi Order? This stretches credibility to the breaking point, and beyond.
2. "Force skills are a double-recessive trait. This explains their rarity." This explanation is inadequate on many levels. The first problem is that it cannot explain the sheer magnitude of the rarity; even with a 1 in 10 million double-recessive trait, you would have at least 100 million Force sensitive people in a galaxy of quadrillions. The only way to whittle down this number to 10,000 Jedi is to assume that only 1 in 10,000 Force sensitive people is identified and trained, which (once again) stretches credibility. The second problem is that it completely ignores all of the five problems cited above (go back and review them if you like); it focuses singlemindedly on the notion of rarity and ignores all the other problems, as if a weak attempt to explain rarity will magically make the other problems go away. The third problem is that it presumes Force sensitivity would just happen to be a double-recessive trait in thousands of separate species on thousands of different worlds, but why? Why would it always be a double-recessive trait in thousands of unrelated species? Sheer coincidence? A quasi-magical compulsion for Force skills to invariably start as a double-recessive trait and stay that way indefinitely, wherever they may happen to independently evolve across an entire galaxy? This interpretation doesn't just stretch credibility; it murders it, and it casually tramples upon the entire conceptual basis of biological evolution just for good measure.
3. "The entire ysalimiri species [from Timothy Zahn's novels, not the films] can block the Force, so Force attunement is genetic." Again, this explanation actually ignores the 5 biology problems cited above. Moreover, it's a non sequitur. So what if the entire ysalimiri species can block the Force? Why does Force blocking lead to Force attunement? A squid's black ink spray blocks eyesight; does this mean that the organ which produces this spray must be able to function as an eyeball? Of course not; the ability to block the Force would seem to be genetic if the entire ysalimiri species has it, but it's also a red herring.
http://www.comicvine.com/capitan-rivet/29-64754/
Capitan Rivet confessed to Empowered that he became a robot after receiving a mechanical sexually transmitted disease from an attractive fembot he met in a bar and that prior to this he was a normal human. He met several of the other Superhomeys in a support group for superhuman STD sufferers and presumably at this point he decided to use his powers for good.
** One of them (Protean) gained power from an alien STD, the second was turned into a mech by nanomachines contracted through sex with an advanced android, the third due to sex with an unknown superhuman whose dialogue suggested he was made by a certain Doctor.
This would explain the ban on sex for Jedi (too many Jedi and nobody is "Jedi Special" anymore) given that mere sex with any other species would make them Jedi too (once the disease completes the genetic transformation). "The Force" may be akin to a chronic herpes with significant benefits.
Of course, this introduces a whole range of logical problems if the alien species of Star Wars universe given that logically, most sexual diseases are not gene-compatible (although they could feasibly cause all sorts of unpleasant mutations). Now fungi and bacteria and parasites (read up on snail parasites for a their chains of hosts) can be trans-species in nature. "The Force" could be a fungi or parasite that carries a virus (like a mosquito carries the malaria parasite) which then rewrites the genetic code to make the host more favorable to their survival, but prefers a sexually-transmissible path (least guarded route of host exchange). This naturally fails to explain how the host organism gains telekinetic powers under the control of the intentions of their brains. Or the power requirements thereof to achieve telekinetic manipulation of objects in their environment. A fungus or parasite would require less physical needs than the rewriting of their host's DNA, but rewriting the DNA would gain benefits for their own survival so long as the host survives. Not a traditional symbiosis, but more akin to "upgrading" the host to become more adept at surviving external deadly encounters thusly continuing the feeding of the fungus or parasite.