The measurement of irrational beliefs has been problematic because of contamination by neuroticism, low reliability, and poor factor structure. Koopmans, Sanderson, Timmerman, and Emmelkamp (1994) developed the Irrational Beliefs Inventory (IBI) to address these issues. As yet, few studies have validated its properties. The current study investigated the psychometric properties of the IBI with an Australian, married sample (N = 127). The findings were consistent with Koopmans et al.; specifically, the results indicated the IBI is (a) is reasonably distinct from neuroticism, (b) is reliable, and (c) measures five constructs. Evidence indicated that the Emotional Irresponsibility subscale may need revision. The IBI correlated in the expected direction with both individual and relationship variables.

The focus of this paper is intimate relationship peak experiences arising from loving or sexual involvement. Different types of peak experiences were described and their relevance to relationship functioning explored qualitatively and quantitatively. In a convenience sample (N = 298), participants who identified having peak experiences were on average significantly older, more passionate, more sexually responsive and had less negative affect. Participants reporting peak experiences of a mystical nature tended to be significantly older and more spiritually focused. We concluded that relationship peak and mystical peak experiences represent important and memorable occasions which are personally significant to some couple members, deepening their bond. As such, therapists may strengthen partners' senses of belonging to the relationship by discussion of peak experiences.