The last couple of time I have had sex with my partner I have orgasimed almost instantly or just when I have penetrated my partner.

That isn't premature ejaculation, which you can't avoid anyway, that is an orgasm, plain and simple. You are getting too worked up, maybe masturbate a couple of hours before.

Condoms help to reduce sensitivity. Try spanking the monkey when you aren't with here instead of waiting days or weeks.