I guess, before I post, I should make this clear. I am against any person, of any age or sex, being forced or persuaded into any sexual act. ( And that includes, rape within marriage) I am also against Yahweh's use of rape to accomplish his will, as in Yahweh's approval of the Israelite murder of the men of Jabesh Gilead, so that the surviving men of the tribe of Benjamin could rape their widows and fatherless daughters. That story started when the men of Gibeah wanted to gang-rape a travelling Levite, who in order to escape that threat gave them his wife instead. During the night she was gang-raped so many times that by the morning she was dead.
(Read the whole story In Judges chs. 19 to 21)
I am also against Yahweh's use of rape to punish David, when he told David that his wives/concubines would be raped because of David's sin. (2 Samuel 12: 11, 12.
OK, having announced my caveat, that ends my polemics.
Bohm:
... things viewed as acceptable in the past are unacceptable today?
This is the nux of the problem. For centuries, if not for all of human existence as a species, the age of marriage seems to have been just after puberty. In some parts of the world (e.g. Christian Ethiopia) it is still the custom. (I can provide references if anyone wants them.).
An essay by published by SUNY Press (SUNY Press is an international publisher of distinguished research and notable works of general interest for the State University of New York, on the topic, Statutory Rape Laws in Historical Context, the author makes the point that in the Statute of Westminster (1275 CE.), statutory rape was sexual intercourse with a female under 12, (later changed to under 10). In colonial America, legal jurisdictions essentially imported the clauses. Some states (the above text states), set the age of consent as 10 and some 12. ( Reference: http://www.sunypress.edu/pdf/60840.pdf , pp10,11 ) The author explains that the law was not a moral standard, but a law protecting the female property of some male. Also in the Americas, the laws were usually applied to white women only.
That custom started to change in the late 19th and early 20th C, until we reach the position we are in today.
It may be noted that puberty is clearly a change point in the progress of a human to a position of full adulthood. In earlier times, I think it could be argued that once through puberty, an individual may have been seen as a young adult. Not so today, childhood has been (in western societies) extended so that even a youth of 16 can be seen as a child. (and there is some biological evidence, that full maturity (for a male anyway) is not reached until the mid 20s.