Is "incest" primarily used nowadays to refer to child sexual abuse by a relative?
Some dictionaries' definitions of incest just refer to it meaning sexual relationships between people who aren't allowed to marry. For example, Cambridge Advanced Learner's Dictionary refers to it as
sexual activity involving people who are closely related and not legally allowed to marry
though the example given refers to sexual abuse:
a victim of incest
Likewise, Wiktionary doesn't refer to sexual abuse in its definition.
By contrast, some uses of "incest" refer to child sexual abuse by a relative, for example the US organisation RAINN, founded in 1994, has "incest" as part of the acronym's name, and Republicans Clash Over Rape and Incest Exception for Abortion in an article published by Time Magazine this year quotes US politicians talking about rape and incest as being part of the same phenomenon.
Does "incest" primarily refer to child sexual abuse by a relative nowadays? Are other terms used for scenarios which are not as commonly regarded as abhorrent, such as distantly related adults having a sexual relationship?