A study by the Australian Research Centre in Sex, Health and Society reports that a majority of men (54 percent) and 42 percent of women were unhappy with the frequency of sex. For most men, the complaint was that they were not having sex as much as they wanted; in contrast, one-third of women complained they were having more sex than they wanted.
Apparently, the problem is not psychological or romantic, but the real issue seems to be that couples are not finding enough time for sex due to other tasks and obligations competing for their time. So stop working and get busy… – Federico
Ref. NYTimes Mar 22, 2011. J Sex Marital Ther. 2011 Mar;37(2):104-15.