From an evolutionary perspective, humans engage in these activities for reproductive purposes. However, according to Alex Comfort, author of The Joy of Sex, sexual activities are closely tied to recreational, reproductive, and relational aspects. For example, while some people completely abstain from sex for religious purposes, other individuals like to indulge in various sorts of sexual practices with several partners. In such cases, the degree of emotional connection is low to non-existent.
A study carried out on college students also showed that sexual activities between young adults encourage an enhanced self-esteem and emotional connection. By this token, therapists often recommend couples to indulge in regular sexual intimacy and consequently stimulate the emotional bond. Physical pleasure is also considered as the driving force behind all sorts of sexual practices.