another from a guy perspective.
There is nothing better than eating a girl out while she is using a dildo on your ass. My wife cums from the moans I make as I am giving here pussy a great tongue lashing and she is fucking my ass. The only problem I have is that the strap-ons that we have purchased are just too damn big. We use a graduated icicle made of glass because it is easier to clean and you don't have to worry about the lye leaching into it if you use soap (we use toy cleaners as well).
now to be fair, I am bisexual and while I prefer women, having a woman or a man fuck my ass while I am eating pussy would be heavenly.