Here are half a dozen recent studies on men & women.  Elliot & Niesta found that red, relative to other colours, lead men to view women as "more attractive and sexually desirable".  Holt-Lundstad & colleagues randomized couples to a "support enhancement intervention" involving shared gentle massage for 30 minutes three times weekly or a control group.  There were encouraging effects of the "warm touch" on multiple stress-sensitive systems including husbands' blood pressure.  Koo et al found that writing about how something good might not have happened (e.g. how one might never have met one's romantic partner) produced more satisfaction (with the relationship) than writing about how the positive event actually had happened (e.g.