Orgasm for contractions

Do clit stimulated orgasms cause contractions too? Or is it only ones caused internally with a dick? Sorry idk what other way to put it 😂 I have a hard time getting off on top or having sex period but can get off in 30 seconds flat with a clit stimulating vibrator. I'm 38 weeks pregnant and have been in pre term labor a few times and I'm 3cm dilated with contractions daily but my doula recommended having sex to get them regular possibly but my DH gets so mad bc I can't orgasm. It's only been an issue during pregnancy.