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Libido , and col­lo­qui­al­ly sex dri­ve, is a per­son­’s over­all sex­u­al dri­ve or desire for sex­u­al activ­i­ty. Sex dri­ve is deter­mined by bio­log­i­cal, psy­cho­log­i­cal, and social fac­tors. Bio­log­i­cal­ly, lev­els of hor­mones such as testos­terone are believed to affect sex dri­ve; social fac­tors, such as work and fam­i­ly, also have an impact; as do inter­nal psy­cho­log­i­cal fac­tors, like per­son­al­i­ty and stress. Sex dri­ve may be affect­ed by med­ical con­di­tions, med­ica­tions, lifestyle and rela­tion­ship issues. A per­son who has extreme­ly fre­quent or a sud­den­ly increased sex dri­ve may be expe­ri­enc­ing hyper­sex­u­al­i­ty, or puber­ty in which the body builds up chem­i­cals and caus­es a high­er sex dri­ve. Asex­u­al peo­ple may lack any sex­u­al desires. A per­son may have a desire for sex, but not have the oppor­tu­ni­ty to act on that desire, or may on per­son­al, moral or reli­gious rea­sons refrain from act­ing on the urge. Psy­cho­log­i­cal­ly, a per­son­’s urge can be repressed or sub­li­mat­ed. On the oth­er hand, a per­son can engage in sex­u­al activ­i­ty with­out an actu­al desire for it. Mul­ti­ple fac­tors affect human sex dri­ve, includ­ing stress, ill­ness, preg­nan­cy, and oth­ers. Sex­u­al desires are often an impor­tant fac­tor in the for­ma­tion and main­te­nance of inti­mate rela­tion­ships in both men and women, and a lack or loss of sex­u­al desire can adverse­ly affect rela­tion­ships. Changes in the sex­u­al desires of either part­ner in a sex­u­al rela­tion­ship, if sus­tained and unre­solved, may cause prob­lems in the rela­tion­ship. The infi­deli­ty of a part­ner may be an indi­ca­tion that a part­ner’s chang­ing sex­u­al desires can no longer be sat­is­fied with­in the cur­rent rela­tion­ship. Prob­lems can arise from dis­par­i­ty of sex­u­al desires between part­ners, or poor com­mu­ni­ca­tion between part­ners of sex­u­al needs and preferences.