I don't think it has anything to do with being sexually suggestive. Plenty of billboards in Manila have far more sexually suggestive material on them.

I personally don't like the billboard and think it could have been done much better but I see little in the way of inappropriate behavior being pictured. Looks more like a honeymoon than a sexpat advertisement to me. Are foreigners not allowed to be photographed showing affection to a Filipina significant other (even though we really don't know her nationality). Would the outrage have been the same if it were a much more attractive, younger and less obese white foreigner? Or how about if it were an Asian foreigner? Me thinks not. However, I can see where some people may take it the wrong way. I just wish people would be honest about why they don't like it and give the REAL reason. (I believe they think it implies/promotes sex tourism and for desperate men to visit the country because some people believe Filipinas have a reputation for being easy. Or possibly because they are racist and don't want white men in their country.)