The issue focused attention at an urgent summit on prostitution on Thursday night in Cologne.Justice Minister Heiko Maas urged politicians not to resort to arbitrary bans or punitive fines."These kinds of bans only aggravate existing tensions between refugees and asylum seekers," Mr Maas told MPs."These tensions must not continue."Germany expects 800,000 asylum seekers this year and expects 500,000 asylum seekers next year.Chancellor Angela Merkel also pledged new legislation that would strengthen penalties for prostitution and pornography."Everyone needs to remember this important