<human>: Quick backstory:

I am at uni with two girls (let's call them Sally and Erica) who are my friends but have recently met and started spending some time together. I have been friends with Sally for just over a year and friends with Erica for about 8 months. Sally is a bit of a narcissist and loves talking about herself, to a ridiculous degree. She shares WAY too much of her personal life with others around her, mostly regarding her sex life. Everything she says, she basically shouts, so she's telling the whole campus/restaurant/street a story when she tells one person.

Erica has only spent a little bit of time with Sally and these graphic sex stories and texts make her very uncomfortable. Sally also messages Erica incessantly and does not often leave her alone. As they are new friends, Erica is not sure how to say anything.

The issue here is that despite being a bit of a pain sometimes, Sally is a nice person and supportive friend, so I don't want to hurt her feelings. I'm not sure how to ask her to back off a little without it seeming very rude.

Condense the text into a few key points
<bot>: Friend shares too much of her personal life with a new friend and messages her constantly, making new friend uncomfortable. How do I discuss it with her without hurting her feelings?