I don't think there's been an explicit topic on this yet, which surprises me because I know that at least some of us here have experimented with this type of thing.
I've been going through another period of what could be called sexual conservation, the rule is simple; no ejaculation or orgasm (excepting nocturnal emissions). Other methods that are practiced have different rules, and the most abundant range of rules lies in taoist literature. What is common to them all is the requirement for at least some form of restraint. This ranges from complete abstinence, to having lots of sex without ejaculating (see Mantak Chia), and the more moderate schools of thought suggest that ejaculation should be regulated simply according to age.
Its been going quite well and has been easier than the first couple of times I've done it. It has been made simpler due to the lack of a regular partner.
Its been about my third or fourth week now, and whilst I've been doing other practices simultaneously (which account for a number of changes I'm experiencing), I've noticed several definate changes in mood, energy levels, sleep patterns, productivity, body functioning, creativity, etc.
I struggle to find a comprehensive analysis of mine and other people's range of experiences in this endeavour. I have read a number of books and websites, but all make a few too many leaps and bounds. One of the better ones which tries to link current scientific knowledge is http://www.reuniting.info/. But it can be a bit of a stretch at times.
Other places to look would be Mantak Chia (who has extensive writings and methods on this subject), karezza, Gnosticism (although reading the books I'm convinced that Samael was schizophrenic or had manic psychosis; religious, bizarre and grandiose delusions, auditory and visual hallucinations), the plethora of qi gong authors all usually have something to say about it, there's some Tibetan Buddhist stuff that I'm aware of more in line with their sorcery schools, and of course the Indian practices like the kama sutra.
