Apart from making sure these messages get consigned to spam, there is not a great deal more you can do; gmail does not allow you to block or blacklist senders or domains. It is possible to create filters; but consensus seems to favour training Gmail's spam filter as a more effective approach. Mark any of these unwelcome messages that arrive in your inbox as spam. You must mark them as spam (not delete them) for gmail's spam filter to learn to recognize what is spam.
Usually gmail does a reasonably good job of detecting vulgar or sexually explicit items and automatically sends them to your spam folder, and if it's already doing that, then you don't need to worry.
If it is not catching things, and they are getting through to your inbox, manually marking them should teach the spam filter learn to recognize them, it sometimes takes a little time and persistence.
You can create filters yourself, for multiple "bad" words, multiple addresses &/or domains; but this does not teach gmail that these items are unwelcome spam.
If it bothers you having this offensive material in your spam folder, you can manually empty spam. Gmail automatically deletes spam after 30 days.
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If you did decide to go the route of creating filters, the best approach is to create a filter that labels the messages, then to regularly go and mark anything that the filter catches as spam.
You can make filters that send straight to trash; but this does not tell gmail that the messages, senders or domains are a source of unwelcome and offensive spam.
Depending upon your location (particularly USA), there are organisations and agencies to whom you can report spam. While it may only have a small impact on the quantity you receive, ultimately, it makes it harder for the senders, so it's worthwhile doing it.