Google’s John Mueller recently confirmed on Twitter that links coming from adult websites are not automatically viewed as spam. Assuming those links are natural links, and do not violate Google’s link guidelines, there is nothing wrong with them.
@Marie_Haynes Adult sites aren't automatically spam, and links from them not automatically unnatural / problematic.
Michael Boguslavskiy is a full-stack developer & online presence consultant based out of New York City. He's been offering freelance marketing & development services for over a decade. He currently manages Rapid Purple - and online webmaster resources center; and Media Explode - a full service marketing agency.