Inappropriate neighbours

Inappropriate neighbours
This works in two ways:

a) if some unsavoury site links to you;

b) if you link to some unsavoury site.

Both are bad.

The first case is bad, because it hurts the trust rating of your site.
If a bad guy links to you - you're also a bad guy.

The second is no better either - it directly hurts your ranking positions.

What do we mean under "inappropriate neighbours"?
This are malware, porn, hack, fishing, casino and other websites of questionable kind.
So do not link to such websites and try to not have any inbound link from them too, though you can't control that directly, of course.