I'm not expert, but could it be a glitch? I don't have seasons any more, but I never had that extent of a problem with aliens.
As for the males being a pest, that is due to a EA lousy relationship design. Or whatever you want to call it. They had the right thought but somehow what was on paper didn't work game wise.
In that aspect, I don't think you can do much. Calls from males, females hitting on your sim, constant flirting males and females, the hearts showing up when you sim meets someone, or even if they don't meet. My sim was in bed when a repairman came in to fix a broken shower and yet there is a popup that they are meant for each other. One male sim was at the computer writing a book when the maid comes to clean the house, they don't even meet, but he has the heart show up over his head and the popup that they are meant for each other.
Those more knowledgeable can offer more help, but all I can think of is save your sim to the bin, with the house if you want to keep it, open up a new game and place your sim there. She will keep all of her levels, pack her books in your inventory to make sure you don't lose them and that may help with the aliens. As for the calls, at least it will for a while.
If you aren't sure how to save a sim to the bin and move to another game, go to edit town, click on house and save it, you will be asked if just household or with house also. If you want sim just household only, if the house, click on that option (I think I have it listed right), save, leave edit town, save game and go to menu and start a new game, when it comes up to chose create a sim, join a household or move one in, just move one in and put your house down on a lot that you like and can afford. It has to be the same size or bigger.
The guide that Carl has give great guidelines, probably explains it better, but this is the basic of doing it. If I have missed anything, someone can step in and fill in that area, I do it so often that it is routine for me, to explain, I may have forgotten a step or out of order.
The guide is a great thing to have for a lot of questions, I still read it at times when I'm not sure about something.