A perfect book (new, well-written & well-illustrated, entertaining, sociobiological...) on sex organs, orgasm etc. is Menno Schilthuizen "Nature's Nether Regions: What the Sex Lives of Bugs, Birds, and Beasts Tell Us About Evolution, Biodiversity, and Ourselves" (I read it in Dutch "Darwins peepshow") - should be read by all biologists IMO. Orgasm has the same function(s) in humans & animals, it's the satisfying feeling that what you were looking for is achieved (cf hunger - eating - satiation) and stops goal-seeking. During female orgasm, the semen is sucked in (with a rhythm of 0.8 sec) and oxytocin is released. Macaque females orgasm more frequently when they mate with higher-ranked males. Etc.
I'd suggest Daniel Goleman - Social Intelligence (particularly the fourth part of the book). At the end of his book you may find quite an impressive list of further articles and books that might help you in your endeavour. I might as well just give you some hints: David Buss 'Sex Differences in Human Mate Preference: Evolutionary Hypotheses in 37 Cultures' - Behavioural and Brain Sciences 12 (1989), pp. ; 1-49 or Jaak Panksepp - 'Affective Neuroscience: The Foundations of Human and Animal Emotions' (New York: Oxford University Press, 1998). The main idea is related to the chemistry created in the human brain during orgasms (oxytocin, vassoprasin, testosterone, serotonin, etc and their specific roles in keeping two partners together long enough so that they can procreate and raise the children in such a way as they could also apply the same mating rules with confidence in their choices). Helen Fisher also has several books that describe the brain chemistry, the first one that comes into my head is "Why Him, Why Her" and 'Why We Love'.
I hope my feedback doesn't come too late.
I'd say above all Alan Dixson (2012. Primate Sexuality). It covers a huge amount of topics, from anatomy to physiology, hormones, and brain areas in a comparative perspective. Another book by him is the 2009 one (Sexual Selection and the Origins of Human Mating Systems), but i found many topics already discussed in "primate sexuality".
Roy Levin wrote a lot on male and female's orgasm and the like. Then, you can check also for "Komisaruk & Whipple (2011). Non-genital orgasms". In Levin you can find references regarding the "upsuck theory" of the female orgasm due to oxytocin which would promote fertilization.
As for the "Value" of orgasm in an evolutionary perspective, I recently came into few people such as Pham and Schackelford, who were involved in why humans perform oral sex and —indeed— the value of it, dealing with mate retention, sperm competition, infidelity detection, and so on.
Good luck!
https://books.google.dk/books?id=Z9N_BokMAMkC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
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