According to a new survey, most guys don't know their wife or girlfriend's sizes. Nearly half . . . 46% . . . don't know her dress size. 72% don't know her bra size . . . and 38% don't know what size shoe she wears.

31% of guys don't know what perfume their wife or girlfriend wears . . . one in eight don't know her favorite type of food . . . and one in 10 don't know what type of music she listens to.

That would make it tough to shop for her . . . but that's okay, because 5% of guys don't know the date of their anniversary, and 1% don't know when her birthday is.

But three out of four guys say they don't think it's IMPORTANT to know those details . . . and 92% said they know what makes her happy.