粉丝 service put simply is stuff the producers do to boost rating usually in 更多 mature anime. The most common one is revealing a girl's undergarments in some way 或者 form. Why is this bad many great 日本漫画 get turned into animes with to much 粉丝 service. 粉丝 service often can ruin an 日本动漫 and reduce its amount of viewers. Not to mention it also lowers the chance of it ever becoming dubbed.
I will now give examples of some animes that overdid this compared to its manga.
1 rosario vampire in the 日本漫画 it is teen at most parts at least, In the 日本动漫 they put a pantie shot almost every 3minutes which can be really annoying and ruin the epicness of the scenes.
However the worst one of my 列表 is girls bravo. This 日本动漫 went beyond words of 粉丝 service. The 日本漫画 was about 15 plus and had few 淋浴 scenes.
In the 日本动漫 there was about 3 bath scenes with nudity per episode making it was mature.
HOPE THIS HELPED THOSE WHO DO NOT UNDERSTAND THE TERM 粉丝 SERVICE.