You can use lossless cut to trim videos nearly instantaneously.

And better yet, trim the videos so that a clip is either hardcore or anal or blowjob but not any two of the three. It's called 3movs because it's supposed to be 3-minute movies for a single kind of sex act, not a 6 or 12 minute movie with categories that don't reflect the content inside the video.

Anal vids should never be categorized with the blowjob category.
If a sex act uses a hole for 50% or more of the video, use that hole category (pick only one: hardcore, anal, blowjob).
Remove blowjob category.