[Menarche, orgasmic capacity and coitarche].

A group of 609 Czech 16 to 18 years old girls was divided according to the age of the first menses into three subgroups: first with menarche between 10 to 12 years, second in 13 and 14 years, third in 15 and 16 years. It was found that the age of menarche did not distinctly influence the course of their sexual development during the puberal period. The mean age of first rendezvous and coitarche did not significantly differ between the followed three subgroups. Out of the whole group of 609 probands 304 girls already had sexual intercourse. The percentage of coitally orgastic girls was highest in the subgroup with an early first menstrual bleeding between 10 and 12 years of age and the difference to the other two subgroups with a later menarche was statistically highly significant (p < 0.005). The opinion is expressed that changes in brain which enable girls to fall in love for the first time are from the point of view of biological prerequisites more important for the beginning of full sexual life in pubertal girls than hormonal development manifested by first menstrual bleeding.