Factors like the difference in age, in social status and in economic status between the sex worker and his client have been cited as major sources of social criticism. Similar social stigma may also be attached to amorous relationships that do not involve direct payment for sexual services, and therefore do not fit the definition of prostitution, but which may be seen by some as a form of "quasi"-prostitution, (in that there is a power imbalance and a reward for companionship or sex). The older member in such relationships may be referred as a "sugar daddy" or "sugar momma"; the young lover may be called a "kept boy" or "boy toy". Within the gay community, the members of this kind of couple are sometimes called "dad" (or "daddy") and "son" - without implying incest. The social disdain for age/status disparity in relationships is and has been less pronounced in certain cultures at certain historical times.