Translation of hélice

I understood that this was a real problem in this country and many foreigners came for sex tourism. Many bad stories had happened but my hosts were decent people. I could tell that right away.
The advantage of this change is that: 1. it improves the response time after every asked word by double. 2. Some do not want to save their lessons, they just want to test it without results being collected...
That is great. Thank you for the support (and for the compliment). Recommendations by universities are always very appreciated, as universities are usually more selective about external resources.