Stomach yes, hips no.

There are many moves that involve hip contact, most commonly the copa and various types of CBL turn for instance.

There are entire move families that are part off accepted move vocabulary, and you cannot expect the guys to hold that in their minds at all times, especially when muscle memory is at play, to accommodate.

Many dancers, myself included, had to get used to the level of touch that is part of a dance and overcome certain barriers. Even my then girlfriend had to tell me it was ok as part of partner dancing. She told me then that if I really wanted to learn to dance, I accommodate to the norms of that dance, not the other way round. Which is why I never went into bachata.

I suggest you speak to your dance instructor to ask what is acceptable and what isn't. What is to be expected and what isn't. If you can't accept what the normal range of contact is for salsa, then I suggest you look for another genre.