I have heard somebody here said that it is still ok! Maybe someone lick your ads, but they did not find the information they need. Then they go Back (From their browser), after that they click into another ads on the certain webpage... They repeat it 3 times but they really browse 1 times/1 webpage of yours!
Just wanted to add, that in fact it is possible. Just yesterday I found myself clicking 3 or 4 links in a links unit because it had exactly the information I was looking for. Bookmarked all sites and will do more research on them later today. So yes, it is possible.