Here is the first (?) application of deep learning to improve the pornography experience, an Android app called Melondream published in early 2017:
Surprisingly, almost 5 years after being published, this app still serves thousands of user sessions per day. That rate continues to slowly grow.
Except for its user interface, the whole app (client and server) was written in Go (https://pkg.go.dev/golang.org/x/mobile/cmd/gomobile).
It uses densenet feature vectors (https://arxiv.org/abs/1608.06993) to allow "touch-to-search" (ha!) with a fractional norm distance metric (https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.23...).
Citation: Discriminative Unsupervised Feature Learning with Exemplar Convolutional Neural Networks (https://arxiv.org/abs/1406.6909).