If the project is free, there's really no need to delay the gratification of the player, unless you just don't have the renders ready yet. You can do this a number of ways:
1. MC "accidentally" sees Mom/Sis/Friend's Mom naked
2. MC has vivid dream or fantasizes about women in game
3. A retelling of the legend of the book/gods shows a sex scene set in Africa
4. MC visualizes women naked or in underwear while in scene with them
5. MC has first sexual interaction with a side or minor character
A good rule of thumb on updates:
1. Adding a couple new scenes--monthly
2. Bugfixes--as needed, and as quickly as possible
3. Major additions or expansions--every 2 to 3 months
4. HUGE expansion or addition--maybe 4 months is excusable, though some kind of preview probably appreciated in that instance
My impression is that most games are started and completed(or abandoned) within a 6-36 month time frame. I think creativity peters out or people lose interest if it takes longer than that, generally speaking. Summertime Saga began in mid-2016 and is still going, but it has regular updates and a sprawling story line. Man of the House started about a year and a half ago. Dreams of Desire was started and completed in under a year and a half, though I don't know how long they were working on it before initial release. Point being, the dev should have both a storyline and a development timetable before they decide to release even the early version, imo. Every novelist starts their novel knowing how it will end.
