Some species of male water striders forcibly copulate with females. in these species, males are often equipped with exaggerated grasping structures, while females have structures that obstruct the male's grip. such a situation could arise through:

Sexual antagonistic co-evolution

Explanation:

Based on the information provided within the question it can be said that such a situation could arise through Sexual antagonistic co-evolution. This refers to evolution between males and females of a species in which they change over time in order to counteract their mate's sex traits, allowing them to maximize their reproductive success. Such as in this scenario where the females have evolved and gained structures that obstruct the male's grip.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d