Hello sir,
I have read your requirements and I am ready to assist you (with ideas for now) in developing this adult sex portal. The site you require sounds like it can be built with wordpress, and it should be an easy build, but your project would really benefit from using an mvc framework (or at least a cmf), with a responsive mobile-first design, and a nice bootstrap flat theme, to make it look clean.
Most all of the frameworks I've worked with lend themselves quite easily to internationalization (with codeigniter standing out, but if you want it to be supported for a long time, we can go with something more robust such as laravel or symfony).
Whatever your choice may be, I for one would go with a custom build. If a custom build is out of the question, then my immediate choice would be wordpress, since it's the easiest cms to work with.
Looking forward to discussing more in-depth with you as well as receiving any other questions regarding my services.
Regards, Adrian Oporanu