We originally had one female cat cookie... Last year this week... she got outside for the first time ever. Well, after the eight day and over 400 flyers later, my wife could take no more so she talked me into getting another kitten. We decided to get two, Sammy & Sweetpea (both males).
Then, the next day, a neighbor up the street responded to one of the 400 flyers we put out...we got our Cookie back!
Sammy & Sweepea (1 year old now) are hillarious together... a complete TRIP!!!
Cookie on the other hand... doesn't like it one bit! It took her 2 - 3 months to get "somewhat" tolerate them but she still does things to get back at, I believe us. She loves to vomit and has been peeing on our clothes and couch recently... A LOT OF PEE on my $1200 LOVE SEAT
It's all worth it though...
Side Note: Keep in mind, that some cats do love buddies, but they are pretty independent as well. Some do get depressed and show you when you leave for a few days.. One of my mother's cats will vomit nonstop until she gets back home when she leaves... and they're still other people in the house. It just depends on your cat's personality and how "dependent" they really are... Some cats could care less than others. Keep in mind sexes too.
Also, I told my wife the only way we could get two more cats (before getting Sammy & Sweetpea) was that she help with the litter...guess who does it EVERYTIME (except for less than 5 times in the last year- what she agreed on during our argument the other night...lol). It seems that male cats love to poop!! It must be Karma coming back at me for never helping my mother w/ scoopin' the poop when I had 12 growing up...