A SFW "path" is as simple as me adding the option to say "no" every time sex is presented, which wouldn't take much rewritting or coding at all. The hardest part would be making checks for any dialogue that mentions sex which I would certainly need help from the community with through bug reports.
A calendar would be a mechanic that allows me to create scenes based on the week, month, or year. Currently the game only keeps track of days, hours, and seconds. Calendars, holidays, and birthdays naturally go hand in hand.