These (fully optional) Deeds represent dangerous, skill-intensive, and profitable Dirty Deeds, and add progression to your SexLab gameplay.
Don't want to do Creature deeds? You can pick them up, click 'Cancel' and drop them, and forget all about them.
Creature Deeds rely on Illusion magic — in order to begin a Dirty Deeds scene with a creature, you must first cast Calm on it (or otherwise pacify it). Higher level creatures need a higher level of Illusion magic or certain Illusion perks to successfully Calm them, but around Illusion 40 with two or three perks is sufficient for all Deeds.
Once a creature is calmed, speak to it. You'll have a new dialogue option which will begin the scene.
Creature Deeds have much more risk, involving travelling into the wilds, and the use of Illusion magic on dangerous animals. But, they are also much more rewarding. Most will give you gold, which is scaled similarly to regular Deeds, according to your Lewd skill and Speechcraft skill.
There is no integration with Defeat, as Dirty Deeds can only be completed successfully if you are in control of the scene. However, you will take Damage from Creature Deeds which may trigger Defeat scenes and their consequences, depending on your settings.
When a Creature Deed scene begins, an invisible area-effect calm spell is cast, which ensures that any NPCs nearby will not fight. This lasts 10 minutes. Once the scene is completed, another area-effect calm spell is cast which replaces it, and lasts for 30 seconds. Once that wears off, NPCs will be restored to their original (violent) state.
When you complete a Creature sex scene in Dirty Deeds, you will take some damage according to the creature and the number of participants in the scene, minus your Lewd skill. Damage adds extra risk to Creature Deeds, as well as a minimum health requirement to have sex with certain creatures and survive. This represents all the biting, scratching, crushing and stretching that is involved with Creature sex.
Damage is multiplied by the number of creature participants. Depending on the creature, they will be more or less likely to begin a threesome, foursome, or five-some — Giants are less likely, while Wolves and Falmer are very likely to group up. Therefore you may want to 'whittle down' the creatures, if you are worried the damage may kill you.
Creature Deeds, and the Damage from them, represents the risk to remain in control of the scene. Are you fucking the creatures, or are they fucking you?
Dirty Deeds scene involving 2 wolves will cause you to take "2 x [Random: 7-30]" damage (so between 14 and 60 damage).
If there are 4 wolves in the scene, the amount is increased to "4 x [Random: 7-30]" (28 to 120 damage). That's a small chance of killing a very low-level player.
1 Giant would cause you to take "1 x [45-140]" damage.
If there were 2 Giants in the scene, the amount would be increased to (70 to 280) damage. Ouch! That's likely enough to kill a lot of characters.
(You can imagine how damaging a scene involving 3 Giants might be...)
However, damage is mitigated by your 'Lewd' sex skill. At Lewd 50, you subtract 50 damage from the amount. At Lewd 100, you subtract 100 damage from the amount.
(Lewd skill comes from SexLab Framework, and is increased every time you have sex with creatures.)
If the damage amount is less than 20, it is not applied. A successful monster fucker will have high Lewd skill, and high Health, to endure the girth and tenacity of creatures.
As result, you'll want to heal between rounds of Creature sex, and be careful about fucking creatures that are too powerful. You may want to wear health-fortifying enchantments, or even drink a potion of fortify health beforehand! A higher-level player will be capable of completing Creature Deeds with ease, and making a lot of gold from them!