Why the weird nicknames?

So my question today is what is up with guys having to call us chicks and asking for pussy among other terms? Well I'm just putting this out there that I think it's because they just feel weird or are embarrassed some how to say sex, vagina, penis/dick. So if they are appalled or grossed out or embarrassed to say those things then how do they think they sound saying they want pussy, or for a woman to suck their pickle, to say anything like that? And in such a question anyone who says those things must see how embarrassing it must seem to the rest of us to hear them talk like that sounding like some idiotic out of touch imbecile. So I want your opinion on they why for these weird and hilarious phrases for something so natural.