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i use GIMP, but i'm not interested in nude- and cumshoops, so i don't have any experience. but i wouldn't recommend jumping right into the advanced stuff. familiarize yourself with layers, selections, paths, all the tools and paints, etc. explore your available options for a while instead of following supposed cookie-cutter tutorials to the letter.
i think it's better to do stuff with GIMP and when you hit a single issue you want to solve you just look it up. The online manual of GIMP is not brilliant but decent enough for a first idea and if you have a question, chances are someone else had it before so just google it.