That assumption would be correct because to engage in sex with someone you own, despite their "consent" is rape by default. The strawman of "forbidden romance" consists of the microscopic minority of slave owners that opted to free their slaves based upon some moral imperative and then get in relationships with them, and even then there are power dynamics and white savior complexes that play into how inherently toxic or abusive these relationships most likely played out. If you, like myself, are a Black person in the Americas and find out you have European DNA that entered your ancestry pre 1860, it is much more likely that genetic intrusion is a result of rape or some violation of consent than not, no matter what rose tinted whitewashing people like to apply to America's history.