Does wearing sexy lingerie help the relationship?
Whilst it will certainly help in the bedroom I'm not sure it will really help the relationship. I suppose it depends what stage the relationship is at, if you are entering into one then it could help spice things up and if you are both trying to work things out then adding a bit of sexiness will certainly help but you both have to be trying.
What it may also do is confirm your worst fears - if getting some sexy lingerie has absolutely no affect what so ever then maybe you need to make a difficult decision.