Modern medicine defines human sexual life as a group of activities that are driven by （）, ended with （）and aimed at giving and obtaining varying degrees of sexual satisfaction .

Modern medicine defines human sexual life as a group of activities that are driven by （）, ended with （）and aimed at giving and obtaining varying degrees of sexual satisfaction .
A.Sexual desire, skin
B.Sexual desire, reproductive organ
C.Excitement of cerebral sexual center,skin
D.Excitement of cerebral sexual center, reproductive organ
正确答案：Excitement of cerebral sexual center,skin