My question is why should the problem of displaying affection be limited to the physical. [If I can get a sense, from seeing a couple in public, that they are consumed by the strong feelings expressed in shir hashirim, than I think that’s not tzanua.] I was assuming they’re equally problematic, and therefore you’re back to being limited to care and respect.
And are you making a distinction between what one may do in front of others vs. in front of one’s children (as far as tznius is concerned) ?