Keeping it sexy

Sean doesn’t know how to ask his girlfriend about why she has let herself go.  It is an awkward conversation that has the potential to really go off the rails.  When they first started seeing each other she would work out with him all the time.  Now she let her gym membership go and stopped running every week.  He thinks this is only the beginning because she doesn’t dress sexy when they are relaxing at home.

I know my guy friends complain a lot about their women getting way too comfortable in a relationship and stop caring about how they look as much.  Do you think it is a good idea to talk to your partner about keeping themselves sexy?

What would you do if your partner gained or loss too much weight?  How would you handle it if your attraction to them started to waiver?