What are the contents of semen?

From _SEX A TO Z_ by Robert M. Goldenson, Ph.D., and Kenneth N. Anderson
Copyright 1989 by Walter D. Glanze, Pub. by World Almanac, P. 243:

Semen content -
a term usually referring to the total content of semen (whereas the
term semen analysis usually refers to the analysis of sperm). The
question of semen content arises especially among persons who
regularly swallow semen, as in fellatio, and who are concerned about
calorie intake and nutritional substances. The average ejaculate of
aboutonia, ascorbic acid, blood-group antigens, calcium, chlorine,
cholesterol, choline, citric acid, creatine, deoxyribonucleic acid
(DNA), fructose, glutathione, hyaluronidase, inositol, lactic acid,
magnesium, nitrogen, phosphorus, potassium, purine, pyrimidine, pyruvic
acid, sodium, sorbitol, spermidine, spermine, urea, uric acid, vitamin
b12, zinc...For analysis of sperm, see SEMEN ANALYSIS.

Note FRUCTOSE and SODIUM (salt) ARE listed.