Strictest Jain answer: It is not automatically a sin if there is no sexual desire, attachment, or lust. But touching the genital area should still be avoided as much as possible, because Jain dharma values control, restraint, and non-indulgence.

If it is done:

• without lust
• without excitement
• without attachment
• only for relief, cleanliness, or unavoidable itch

then it is not the same as sexual misconduct.

However, from the strictest Jain ascetic view, even such actions should be kept to the bare minimum, because the goal is to reduce bodily attachment and careless activity.

So the strictest practical answer is:

• Sexual desire present: Yes, it is sinful.
• No desire, only unavoidable itch/cleaning: Not a major sin, but still something to minimize.

In short: not automatically a sin, but not something to do casually.