lowkey kinda spoilers
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It doesn't turn into an ecchi but there are a bunch of women going after him but he only returns 2 of their feelings and when he does he is very devoted and doesn't just ignore them (like most ecchis where the mc just likes them for body). And when he does like them he like LOVES them yk? Sorry if this just made it more confuzzling.
It doesn't turn ecchi in the entire novel. In fact, I can recall MC had sex only once, or perhaps twice in a span of almost 10k years. The dude is totally devoted to cultivation living in caves and doesn't care on anything else. I stopped reading at chapter 1644 and wait for the novel to advance. The last I can recall is that he was in the process to save his second wife.
Btw, I think the novel is writted by different authors and the first author retired after MC exits his original world. That may be the reason the novel gives a vibe of separation between every arc where the items or people he met before will never appear in further arcs.
Seems this is an adaptation from a chinese novel: https://www.xbiquge.cc/book/19847/