@mentat that looks like a 3rd party ad. (But looks can be deceiving).
Block ad
Block ad-words account (if not 3rd party)
Block url
and if 3rd party
I would block the ad-network.
Use ad-balance, it does a lot towards blocking this type of spam proactively. It isn't fool-proof but if you are seeing a lot of ads like this, ad-balance will help reduce it.
@sdk
I'd prefer Russian dating ads, rather than vague, not related, ads I'm seeing on my pages.
To each his own. Remember that ads are often served based on the user's interest, so an ad that may seem vague and on related to you, may in fact be very engaging to the user. What is deemed acceptable is subjective and is very much related to the target audience of your site. My main site is more family oriented, these types of ad are not acceptable, even if a user has specific interest in Russian dating. The association of Russian dating and my brand is not something I want to promote, so I will gladly forgo a click to protect my brand.
Moreover, these types of ads tend not to be user targeted or contextual but rather the result of buyers simply buying un-sold inventory on the cheap and in high volumes in the hopes of getting sufficiently large number of clicks to turn a profit.(This is why ad-balance is effective at blocking much of this crap). Whereas, the seemingly vague and unrelated ads have a higher probability of being user targeted.