▁this ▁method ▁directly ▁measures ▁changes ▁in ▁temperature ▁of ▁the ▁lab ia . ▁More ▁recently , ▁las er ▁do pp ler ▁imag ing ▁( L DI ) ▁has ▁been ▁used ▁as ▁a ▁direct ▁measure ▁of ▁gen ital ▁sexual ▁ar ous al ▁in ▁women . ▁L DI ▁functions ▁by ▁meas uring ▁super f icial ▁changes ▁in ▁blood ▁flow ▁in ▁the ▁vul var ▁t issues . ▁ ▁Category - specific ity ▁Category - specific ity ▁refers ▁to ▁a ▁person ▁showing ▁sexual ▁ar ous al ▁to ▁the ▁categories ▁of ▁people ▁they ▁prefer ▁to ▁have ▁sex ▁with . ▁Sex ual ▁ar ous al ▁studies ▁involving ▁category - specific ity ▁look ▁at ▁gen ital ▁responses ▁( phys i ological ▁changes ), ▁as ▁well ▁as ▁subject ive ▁responses ▁( what ▁people ▁report ▁their ▁ar ous al ▁levels ▁to ▁be ). ▁Category - specific ▁sexual ▁ar ous al ▁is ▁more ▁commonly ▁found ▁amongst ▁men ▁than ▁women . ▁H eter osex ual ▁men ▁experience ▁much ▁higher ▁gen ital ▁and ▁subject ive ▁ar ous al ▁to ▁women ▁than ▁to ▁men . ▁This ▁pattern ▁is ▁revers ed ▁for ▁hom osex ual ▁men . ▁ ▁Studies ▁have ▁found ▁that ▁women ▁have ▁a ▁non - category - specific ▁gen ital ▁response ▁pattern ▁of ▁sexual ▁ar ous al , ▁meaning ▁their ▁gen ital ▁responses ▁are ▁only ▁mod est ly ▁related ▁to ▁their ▁preferred ▁category . ▁On ▁the ▁other ▁hand , ▁female ▁subject ive ▁responses ▁are ▁category - specific , ▁because ▁they ▁typically ▁report ▁their ▁highest ▁level ▁of ▁ar ous al ▁to ▁their ▁preferred ▁stim ulus , ▁although