▁that ▁sexual ▁cogn itions ▁impact ▁h orm one ▁levels ▁in ▁women , ▁such ▁that ▁sexual ▁thoughts ▁result ▁in ▁a ▁rapid ▁increase ▁in ▁test oster one ▁in ▁women ▁who ▁were ▁not ▁using ▁h orm onal ▁contra ception . ▁In ▁terms ▁of ▁brain ▁activation , ▁research ers ▁have ▁suggested ▁that ▁am yg d ala ▁responses ▁are ▁not ▁sole ly ▁determined ▁by ▁level ▁of ▁self - report ed ▁sexual ▁ar ous al ; ▁Ham ann ▁and ▁colle agues ▁found ▁that ▁women ▁self - report ed ▁higher ▁sexual ▁ar ous al ▁than ▁men , ▁but ▁experienced ▁lower ▁levels ▁of ▁am yg d ala ▁responses . ▁ ▁Mod els ▁of ▁human ▁sexual ▁response ▁ ▁Human ▁sexual ▁response ▁cycle ▁ ▁During ▁the ▁late ▁ 1 9 5 0 s ▁and ▁early ▁ 1 9 6 0 s , ▁William ▁H . ▁Masters ▁and ▁Virginia ▁E . ▁Johnson ▁conducted ▁many ▁important ▁studies ▁into ▁human ▁sexual ity . ▁In ▁ 1 9 6 6 , ▁they ▁published ▁Human ▁Sex ual ▁Response , ▁detail ing ▁four ▁stages ▁of ▁phys i ological ▁changes ▁in ▁humans ▁during ▁sexual ▁stim ulation : ▁excitement , ▁plate au , ▁org asm , ▁and ▁resolution . ▁ ▁S inger ' s ▁model ▁of ▁sexual ▁ar ous al ▁Barry ▁S inger ▁presented ▁a ▁model ▁of ▁the ▁process ▁of ▁sexual ▁ar ous al ▁in ▁ 1 9 8 4 , ▁in ▁which ▁he ▁concept ual ized ▁human ▁sexual ▁response ▁to ▁be ▁composed ▁of ▁three ▁independent ▁but ▁generally ▁sequ ential ▁components . ▁The ▁first ▁stage , ▁a est h etic ▁response