If you mean actual intercourse then that is gonna be years away..
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Actually, things are progressing faster than one would think....
Honestly, from a story telling standpoint based on what content is already out there, we could still be in the introduction stage and setting of the plot, and the Chris hand job still be away for another 2 to 3 releases out (or 9ish months away). Mr. Palmer could have just had it that Anna just gets groped and have focused in on all the inner emotional turmoil and fallout stemming from it alone.
Further the developer could still be doing back stories about Grant and other 'history' that paints out Anna's total character. But it's all coming out as we go. In the last update, Anna admits she love the attention of men. Ideally from Chapter 1 that might have been explained first and perhaps used in how David and Anna's relationship is affected by it. However rather the developer is giving us Anna information through his eyes as the story unfolds.
Now...
How far out are the other paths? Hard telling, but we know the Leanard path is way off in the distance (assuming there is one) and the Marcel path is at least 2 updates away before he comes seriously in the picture.
Marvin has his own thing going and events can take off in any direction at any moment. He was ahead of everyone else till Chris got yanked in the shower. Assuming the player that is allowed Marvin a perv view of Anna's cleavage, got to crawl a hand up her thigh, or got to butt rub... Robinson a close second with the boob massage. Maybe I am also forgetting something, but it doesn't matter because at least (if that's the developer's plan), Marvin can get some good Marving in that is plausible in the story.
But still as I have said before, the clock is ticking for events upcoming, drinks with Jake/Kendra, dinner with Grant, and then business trip with Hank. At worst Mr. Palmer pushes each of those events into 2 release updates (perhaps even 3 updates if it's huge plot development) or if some events somewhat overlap and all of it can't be done in one update.
The one thing that seems to track that the developer is working with a plan in mind. And with as many paths available and the developer trying to show the evolution of Anna's lusty side it's going to be like the horse races. Some will jump out in front, others will catchup and surpass the early leaders and things will be like that till we hit the finish line. And all that doesn't include something already planned that none of us are expecting...some side event or adventure(s).