When I have sex with my wife I cum and finish in just 2~3 minutes. So, in the past my wife used my cum as a lube to be penetrated by her bull's huge cock.
Now, after all these years, she can easily accept his huge cock deep inside her without the need of a lube. Since two years ago she doesn't let me cum inside her anymore. So, if she needs a lubricant she asks for my tongue, not my cum anymore.