▁leads ▁her ▁to ▁seek ▁out ▁and ▁be ▁re cept ive ▁to ▁sexual ▁stim uli ; ▁women ▁then ▁feel ▁sexual ▁ar ous al , ▁in ▁addition ▁to ▁sexual ▁desire . ▁The ▁cycle ▁results ▁in ▁an ▁en hanced ▁feeling ▁of ▁int im acy . ▁Bass on ▁emphas izes ▁the ▁idea ▁that ▁a ▁lack ▁of ▁sp ont aneous ▁desire ▁should ▁not ▁be ▁taken ▁as ▁an ▁indic ation ▁of ▁female ▁sexual ▁d ys function ; ▁many ▁women ▁experience ▁sexual ▁ar ous al ▁and ▁respons ive ▁desire ▁simultaneously ▁when ▁they ▁are ▁engaged ▁in ▁sexual ▁activity . ▁ ▁To ates ' s ▁in cent ive - mot iv ation ▁model ▁Frederick ▁To ates ▁presented ▁a ▁model ▁of ▁sexual ▁motiv ation , ▁ar ous al , ▁and ▁behavior ▁in ▁ 2 0 0 9 ▁that ▁comb ines ▁the ▁principles ▁of ▁in cent ive - mot iv ation ▁theory ▁and ▁hier arch ical ▁control ▁of ▁behavior . ▁The ▁basic ▁in cent ive - mot iv ation ▁model ▁of ▁sex ▁suggests ▁that ▁in cent ive ▁c ues ▁in ▁the ▁environment ▁in va de ▁the ▁nerv ous ▁system , ▁which ▁results ▁in ▁sexual ▁motiv ation . ▁Pos itive ▁sexual ▁experiences ▁enh ance ▁motiv ation , ▁while ▁negative ▁experiences ▁reduce ▁it . ▁Mot iv ation ▁and ▁behaviour ▁are ▁organized ▁hier arch ically ; ▁each ▁are ▁controlled ▁by ▁a ▁combination ▁direct ▁( external ▁stim uli ) ▁and ▁indirect ▁( internal ▁cogn itions ) ▁factors . ▁Ex c itation ▁and ▁in hib ition ▁of ▁behavior ▁act ▁at ▁various ▁levels ▁of ▁this ▁hier arch ical ▁structure .