Force fights in the areas where Arona doesn't spawn in the Foothills, but the wyverns do. Get wyvern venom and use it on yourself. Also if you didn't take the libido starter perk, you can get it by going to the old forest and have seasonal events always spawn in the game menu - get the halloween kas event and when it tells you to pick up a bottle of wine, chose the take two option - the wine increases your libido and also gives you the perk to increase your libido gains.