Romance is any affectionate act that takes place between lovers, wherein one partner woos the other. It can serve as foreplay, though not necessarily; it's aimed at the emotions rather than just the sex drive. It is used to establish and maintain intimacy and emotional closeness in a sexual relationship.
Anything from simply expressing your love for the other, to taking them out for an evening activity, can serve as romance.
A term that a mother uses to describe any single man she approves of and fantasizes about her daughter marrying, but for whom the daughter usually claims to have zero interest in *that* way.
A man labelled a "nice guy" is often a superficially respectful and intelligent, but also frustratingly indecisive or cowardly person who won't get the aforementioned girl because he won't initiate or ask.
Sometimes, the girl dislikes him and finds him boring because he always plays his life safe and fails to go out and accomplish anything interesting with it. (This is why the mother likes him.)
Other times, he is a friend of the girl and desires a relationship with someone, but fails to consider the obvious candidate. (This is the most cliched of romantic-comedy cliches).
Mother: "That guy who dropped you off home seemed like a nice guy."