Final answer:
Ischiocavernosus muscles, in males, function to maintain penile rigidity during erections by compressing the erectile tissue, while in females, they assist in cl_itoral erection and may contribute to vaginal contraction during orgasm.
Step-by-step explanation:
The function of ischiocavernosus muscles in males and females is related to sexual function. In males, the ischiocavernosus muscle contributes to the rigidity of the pe_nis during erection by compressing the base of the erectile tissues and restricting the return of blood. This action supports the erection by maintaining an increased volume of blood within the pe_nis. On the other hand, in females, the ischiocavernosus muscle assists with c_litoral erection and, to some extent, may play a role during orgasm by contributing to the contraction of the vagina and the tension around the c_litoral complex.