yes.
Yes; the male is only cleaning his sister. My cats (both female) tend to do the same thing in various spots.
yes this is a common mating ritual. it is done as a seducing technique. Also there are certain traces on a female cats bottom that is benificial to a male cats digestive system
no your not gay but the male does have a g-spot in there anus wich can create a orgasm or strong feelings
There is nothing to worry she just wants to get attention and mate
Female cats produce a special hormone when they are in estrus to let the male know they are ready to mate. In essence, this mating position is an advertisement to male cats that they are in heat and ready to mate.
Because you let him.
If he is not nutered then he was probaly in a fight with another male and got bitten or scrated by his scrotal area. This is very comman when male cats fight.
you can't make a male lick the female unless the male likes the female.
Yes, most male cats after being neutered lick on their genitals. Their saliva contains a natural disinfectant which will keep them from getting bacterial problems after being fixed.
Most cats that are on friendly terms with each other will lick and groom each other.
Usually because they like each other but sometimes it could be cause they are lonely and have no other cats to lick. It is called grooming and it is a way to get clean. So if you have two cats that like each other and they lick their private areas because of that.
As in cats that are male? Yes, cats can be male or female.