For over a decade he starred or co-starred in nearly all notable films in this genre and became hopelessly typecast, usually playing naive, likeable guys with a healthy sexual appetite.
He is especially remembered for the Bedside-films and Zodiac-films, though his big breakthrough was as the romantic lead in Annelise Meineche's Sytten (1965).
He debuted at the People's Theatre in 1962 and was already in the apprenticeship role of the mischievous Nicholas in Nøddebo Præstegård.
After a few small roles, the breakthrough of Erik Soya's Sytten in 1965 began a wave of erotic films for Søltoft.
In Den røde rubin, Søltoft starred as Ask Burlefot, who goes from shy schoolboy to sexually experienced.