My girlfriend started riding on the back but now she rides her own. Niether of us have cars now so with bikes being are only transport we tend to ride two-up (or take the Hack) when we are out doing errands or going to visit people, normally only ride seperate bikes if we are going for a fun ride or trip. Having a good rider on the back is really fun because they know when to lean and you can really get moving in the twisties. Since I commute about 120 miles a day on the bike its nice to just hop on the back or in the sidecar sometimes and let her drive when we go places in the evening.
2004 Ducati Multistrada 1000ds