When a girls sucks a guys penis or a guy licks the girls vagina.
Geschlechtsverkehr = sex Sex = sex Geschlecht = sex (as in gender)
Sex-liked means liking sex and sex determined is the resolution to have sex.
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the historical background of different cytology:1. SEX!!!2.SEX!!!3.SEX!!!4.SEX!!!5.SEX!!!6.SEX!!!7.SEX!!!8.SEX!!!9.SEX!!!10.SEX!!!11SEX!!!12.SEX!!!13.SEX!!!14.SEX!!!15.SEX!!!16.SEX!!!17.SEX!!!18.SEX!!!19.SEX!!!20.SEX!!!21.-Infinity: SEX!!!
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Obviously when something is funny duh.
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A sex-inluenced trait means a trait turns on or off depending on your sex (male or female) a sex-linked rait is a trait on your sex cromosome sex-limited trait : Trait expressed in only one sex.
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