Is there a "gay" community?
Yes, there is but TAKE NOTE -- Sexual acts between people of the same sex are illegal. Prison sentences apply.
Please take a look at the general information on the Australian Smart Traveller wbsite. It is not PNG specific but provides guidelines that may keep you out of trouble. -- Advice for LGBTI travellers | Smartraveller
Research the laws, customs and attitudes of where you’re going. Follow the local laws. Even if you disagree with them.
Tags: LGBTI information, smartraveller