NEW BAN in alcohol commercials:
Using the GokoGoku gulping noise as well as casting actors and animated characters under 25 years old is "NG"
livedoor.com | April 23, 2017 (in Japanese)
• "Liaison Council on Drinking" strengthened the voluntary standard for advertisements in July 2016
• Regulation to prohibit using gulping sound effects such as the ゴクゴク/gokugoku noise in TV advertisements for beer, chu-hai, and other alcoholic beverages
• No casting actors under 25 years of age, which extends not only to television commercials but also to animated CMs.
More... (in Japanese)
Examples of for 下品 ゴクゴク音/gehin gokugoku noise in TV ads:
https://youtu.be/cS5If6CC6XI?t=5s
https://youtu.be/N79U94V0GL4?t=30s
https://youtu.be/7U3bdvMUq6M?t=2m8s
https://youtu.be/3nmt4uX0bdc
Super gay gokugoku:
https://youtu.be/4kf3PQi8Pyk?t=29s
https://youtu.be/ohlxZSRzmV0?t=31s