There are three main interpretative approaches to Hosea chapters 1-3. The first is the symbolic view which treats the marriage as a symbol or a vision utilized by God to teach Israel lessons about His marriage to them. This view is held by a lot of the older commentators. For instance, John Calvin says, “There is no doubt but that God describes here the favor He promises to the Israelites in a type or a vision: for they are too gross in their notions, who think that the prophet married a woman who had been a harlot.” The commentators who take this position indicate that if Hosea had in fact married a harlot, his ministry would have been undermined.
The second position may be called the proleptic view. The idea here is that Gomer was chaste when Hosea married her and then she engaged in unfaithfulness. This doesn’t really solve the potential problem; it still sets forth a situation where God commands Hosea to marry a woman that He knew would be a harlot. Click to read more about “Did Hosea Really Marry a Harlot?”