Rule number one when considering using a butt plug is make sure it is clean. The wall to the rectum are thin and absorbent and dirty sex toys can present health risks and infection. A good rule is to consider whether you would be happy placing the plug in your mouth, if not wash it thoroughly preferably with an anti bacterial cleaner.
If you are considering using a butt plug on your partner latex gloves can be a useful addition as they are the cleanest and rid you of any rough surfaces on your hands
Using a condom on an anal dildo or butt plug makes for a quick and easy clean up and is imperative if you are considering sharing your toys.
Despite the practice being seen on many a porn feature it is important not to place something into your ass and then your vagina. The bacteria in your back passage should not be transferred to your genital area. Placing a condom onto a dildo before transferring it to your vagina allows you to quickly whip off the rubber before commencing with penetrative play.
Sex experts recommend using a baby wipe to stop lubricant travelling down from your arse to your vagina. Simply mop up any traces that seem to be about to mix with your natural lubrication.