Is it possible to accidentally follow someone on X (Twitter) without realizing it?

I’m trying to understand how following works on X (Twitter).

My boyfriend recently showed up as following an NSFW account. It was a new follow and the account has since been suspended. When I asked him about it, he said he genuinely has no idea how it happened and that he didn’t intentionally follow it.

I’m trying to keep an open mind, but I’m confused about how someone could end up following an account like that without realizing it or without really seeing the page.

Is there any realistic way someone could accidentally follow an account on X? And if a post from that account just appeared in someone’s feed, does that necessarily mean they had interacted with similar content before? He mentioned he hasn’t seen NSFW content in his feed in a while, which is why I’m even more confused.

Also, if someone accidentally followed an account, would they usually have had to view the profile or posts first, or could someone theoretically end up following it without really seeing or interacting with the account’s content at all?

I’m not trying to accuse him of anything, I’m just genuinely trying to understand what’s technically possible on the platform.