Are there specific body parts besides genitals and breast that are need to trigger certain scenes

[Yokemon61210]

ex: eyes, lips, specific milk type

 

[Theron]

There are a few Taur-specific scenes (though it locks you out of some stuff, too).

There are some Tail genital specific scenes.

 

[valk42]

tentacle wings, being naga, the odd SnakeByte exclusive scene

 

[lopbat]

Sex scenes by uncommon requirement - Trials in Tainted Space Wiki

wiki.smutosaur.us

Usually with things like milk, you can get them with any kind and a paragraph or so might differ based on the type (the only exception I can think of is the naleen female breastfeeding scene, which requires plain milk). Can't think of any instance that's gated based on having a specific type of body part to unlock besides these (taur, naga, parasitic genitails, etc)