theres a virgin end but its just an achievement, its also a bad end in a sense since lona dies alone a hag unloved and forgotten, you can get it trivially through rebirth, frankly virginity is only worth money ultimately, so theres no point in preserving it since it locks you out of rebirth, if you don't get pregnant and birth out a kid.

Rebirths are also a core concept of the game that are required to change lonas race,reset quests getting up to 6 more trait points (per rebirth) for a max of 98 levelup tp 5 rebirth TP and 1 boat rebirth TP and is also useful for updating save file to the current version of the game.  You keep whatevers in your bank whatever hairstyle you are wearing and whatever dye is in your hair when you do a rebirth.

When You prostitute lona there is extra option to say that she is still a Virgin. If Sexy is high enough and You talk to nobles of Noer Town You can easily get 10 Large Copper Coins / Virginity. ( which is almost 1 Gold Coin ), Virginity can be used as one time extra profit from Vaginal Prostitution.

Once You lose Virginity, prostitution at Noble part of the Town will not be as beneficial.

Also it's very important to remember to tell to Your customer about Lona Virginity, because if You don't You will earn as for normal sex.

No Virginity: ( values for Nymph & 10 CON )

• Tavern: ~5 small/15 small copper coins 
• Marketplace: ~5/20 small copper coins
• Noble: ~7/30 small copper coins ( ~2 Large Copper coins )

Virgin: ( values for Nymph & 10 CON )

• Tavern: ~7/20 small copper coins
• Marketplace: ~10/30 small copper coins ( ~2+ Large Copper coins )
• Noble: ~30/90 small copper coins ( ~ 7+ Large Copper coins ) ( or even more !!! )

Ofc. remember that amount of money lona earns via sex depends on how well You play Sex Minigame, if she is just laying and waiting like a plank... she not gonna make much money... well maybe it' worth to note that if You play it very well You can even get more than 1 Large Copper Coin from Dancing Minigame ;P

Whore is best way to make huge $$$ in Lona :D 

//Edit:

That's ofc. level 99 Whore but well... using her body right way: ( and note it is just a Tavern :D )

I don't know if Eccma know how to break his game but basicly 

93 CON + High Sex + right Gold Piercing + Cum on Body You can easily make ~20 Gold / day ( and i mean "in game" day ) at 99 level if You spend at least 90 points into CON You can make insane bucks, and if You save her Virginity or You are on NG+ then Virginity can get You even more... 

I would say that if You play this game for the first time, save her Virginity until You can enter Noble part of the city and lose her virginity there...