Cock milking machine, with various speed settings and suction strengths. Variations can include one that strokes up and down, or like a cow milker that handles all stimulation internally, and just stays flush with the body.

Whether it be actual laying, or just stuffing egg-like objects into (and back out of) orifaces.

let us use a subject's dick on themselves, other subjects, or even just display them on a wall

Distending the recievers belly upon anal or vaginal penetration.

Smothering, choking, garroting, underwater, latex masks, plastic bags, manual, either with or without safety limits.

Tail actions:

-moves according to the mood

-be grabbed by somebody and tickle the wearer

-pull the tail

-tail can get caught by a door (ouch!)

Mutate subjects in to having multiple penises, multiple sets of testicles, etc., to help double penetration, or generation massive amounts of sperm.

we use the hand tool only to touch the genitals but why not use it to pet them on the chest/belly/head/legs or even use your fingers on the test subjet's mouth.