Can a moderator give a look at it?
I think it is, at least, borderline.
The user's profile picture has been changed to a generic identicon avatar.
In general, profile rules on Stack Exchange are pretty lax. Some things are allowed that would not be allowed in posts, comments, or in chat:
When in doubt, flag a post of the user's for moderator attention (or contact Stack Exchange, if you really, really want to). A moderator will try to figure out a course of action (see these guidelines, if you're curious).
In the present case, the image contained content that was sexual in nature. There was no nudity, and it's unclear whether or not it would be Not Safe For Work. Like many cases of controversial content in profiles, it was a judgment call as to what to do about it. Working from the guidelines above, the image was removed.
Anytime you see something that you find questionable on the site flag it.
If it's an avatar or something posted or linked in a user profile, flag one of the user's posts using a custom mod message explaining what you think the problem is.
If the questionable content is in a question, answer, or comment; flag the content directly using a "rude or abusive" flag.
rude or abusive A reasonable person would find this content inappropriate for respectful discourse.